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Summary ✨ Trigonometry (mathematics) 📚📍

"Trigonometry" is the branch of mathematics that deals with angles, triangles, and trigonometric functions, with the Greek word trigonon = 3 angles and metro = measurement.

Let's start by considering a right triangle ABC with an acute angle A and an acute angle C, if we consider a non-right angle A, we will find that sin A, cos A, and tan A are the values associated with the length of each side of the triangle, which is called the "trigonometric ratio" for cosec, sec, and cot are the reciprocals of sin, cos and tan.

The trigonometric ratio of angle A is always a constant and the symbol sin A is used instead of the sine of angle A, cos A represents the cosine of angle A, and tan A represents the tangent of angle A.

Cross = the length of the side opposite angle A.

Scene = the length of the hypotenuse.

Adjacent = the length of the adjacent side A

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2024/7/7 Edited to

... Read moreส่วนที่หลายคนพลาดตอนอ่าน “ตรีโกณมิติ ม.3” คือจำสูตรได้ แต่ทำโจทย์ไม่ได้เพราะสับสนเรื่อง “ด้าน” กับ “จตุภาค/เครื่องหมาย” เราเลยสรุปขั้นตอนที่ใช้จริงเวลาเจอโจทย์ sin cos tan ตาราง + โจทย์ 37° 53° ให้เป็นระบบมากขึ้นค่ะ 1) เช็กก่อนว่าโจทย์อยู่ใน “สามเหลี่ยมมุมฉาก” หรือ “วงกลมหนึ่งหน่วย” - ถ้าเป็นสามเหลี่ยมมุมฉาก: ให้ตั้งมุมแหลมที่โจทย์ถามก่อน แล้วค่อยระบุ ข้าม-ชิด-ฉาก ให้ถูก (ข้าม = ตรงข้ามมุม, ชิด = ติดกับมุม, ฉาก = ด้านยาวสุด) - ถ้าเป็นวงกลมหนึ่งหน่วย: คิดเป็นพิกัด (cos x, sin x) และดูจตุภาคเพื่อใส่เครื่องหมาย +/− ให้ถูก 2) ตารางมุมที่ควรรู้ (องศา ↔ เรเดียน) และค่าพาย (π) มุมที่ออกบ่อย: 0°, 30°, 45°, 60°, 90° และมุมใหญ่แบบ 120°, 135°, 150°, 180° จำคู่พื้นฐานนี้ไว้ก่อนจะไวมาก: - 0° = 0 - 30° = π/6 - 45° = π/4 - 60° = π/3 - 90° = π/2 - 180° = π - 270° = 3π/2 - 360° = 2π เทคนิคแปลงเร็ว: องศา → เรเดียน คูณ π/180 (และกลับกันคูณ 180/π) 3) ใช้วงกลมหนึ่งหน่วยเพื่อ “ยุบมุม” (reference angle) เวลาเจอมุมเกิน 90° เช่น 150° หรือ 225° อย่ารีบท่องตาราง ให้ทำ 2 ขั้น: - หา “มุมอ้างอิง” (มุมแหลมที่ใกล้แกน): เช่น 150° มีมุมอ้างอิง 30° - ใส่เครื่องหมายตามจตุภาค: จตุภาค I: sin +, cos +, tan + จตุภาค II: sin +, cos −, tan − จตุภาค III: sin −, cos −, tan + จตุภาค IV: sin −, cos +, tan − แบบนี้จะหาค่า sin cos tan ได้จากตารางมุมแหลม แล้วค่อยติดเครื่องหมายค่ะ 4) โจทย์ “ตรีโกณมิติ 37° 53°” ทำยังไงให้เร็ว ชุดนี้มาจากสามเหลี่ยมมุมฉากอัตราส่วน 3-4-5 (เป็นข้อสอบยอดฮิต) ถ้าให้มุมประมาณ 37° กับ 53° มักตั้งให้: - sin 37° = 3/5, cos 37° = 4/5, tan 37° = 3/4 - sin 53° = 4/5, cos 53° = 3/5, tan 53° = 4/3 ทริกคือ 37° กับ 53° เป็นมุมคู่กันในสามเหลี่ยมมุมฉากเดียวกัน (สลับข้าม-ชิดกัน) 5) ตัวอย่างแนวโจทย์ที่เจอบ่อย (ทำตามขั้นตอนนี้) - “ให้ sin A = 3/5 และ A อยู่จตุภาค II จงหา cos A, tan A” ทำ: จตุภาค II → sin + แต่ cos −, tan − จากนั้นใช้ความสัมพันธ์สามเหลี่ยม 3-4-5 ได้ |cos|=4/5 → cos A = −4/5 และ tan A = sin/cos = (3/5)/(−4/5)= −3/4 6) พื้นฐานกราฟที่ควรรู้ก่อนอ่านต่อ จำคำ 3 คำนี้พอ: แอมพลิจูด (A) = ความสูง, คาบ (T) = ความยาวหนึ่งรอบ, และกราฟพื้นฐาน y = sin x, y = cos x ที่วนครบ 1 รอบที่ 2π บนแกน x (เรเดียน) ถ้ากำลังทำชีท/สรุปลงสมุด แนะนำให้เขียน “ตารางมุม + วงกลมหนึ่งหน่วย + เครื่องหมายจตุภาค + คู่ 37°/53° (3-4-5)” ไว้หน้าเดียวก่อน จะช่วยทำโจทย์เร็วขึ้นมากค่ะ

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I’ve been studying for the TExES Core Subjects EC–6 (391) Math exam, and because I’m a visual learner, I started creating my own study notebook. I wanted something that was cute, organized, and actually made me want to study. 🌸 One day my husband looked through my notes and said, “These are too
Miriam Wong

Miriam Wong

2 likes

Let’s save this rule! ☘️
This is why (-3) × (-4) = 12 Summary of Rules for Multiplication: • (+) × (+) = + (friends) • (-) × (-) = + (yes! two negatives make positive!) • (+) × (-) = - • (-) × (+) = - Easy memory: Same signs = Positive, Different signs = Negative! Save this post — you'll need it for tomorr
Patrick Oni

Patrick Oni

1 like

Master Math with These YouTube Gurus!
Unlock the secrets to mastering your math classes! 🎓✨ From basic algebra to advanced calculus, discover the top YouTube channels that turn complex problems into simple solutions. Whether you're looking for step-by-step tutorials or comprehensive course reviews, these YouTubers have you covered.
CompSkyy

CompSkyy

3748 likes

✨SCHOOL TIPS!✨
how to PASS ✨math class!✨✏️📚📓➗💯 #BackToSchool #math #schooltips #forthegirlies #girlssupportinggirls
bella rosa

bella rosa

7659 likes

Try this proven strategy to study Math! 🎓
Interleaved Practice in a Nutshell: 🔀 Involves mixing different types of problems within a study session 🧠 Enhances long-term retention and transfer of mathematical skills 📚 More effective than blocked practice for complex problem-solving What do you think of this strategy? Follow me for
teal.days

teal.days

31 likes

Types of revision I did and how Useful it is
Gcse’s books are the most helpful as they show questions which may appear on the exams as well as exam question if you can’t print any past papers. Past papers reveal what questions were on the previous year’s exams which could appear again giving an insight into what’s on the exams and how to s
Amelia

Amelia

9 likes

Mathematics Quiz- Can you get 7/7?
#quiz
QuizKingsUSA

QuizKingsUSA

5641 likes

math notes
Cte Bruno

Cte Bruno

53 likes

websites to help you with math! 🧮
Using websites to help with math can be a great way to supplement your learning and gain additional support. When using these websites, it's important to stay organized, set goals, and actively engage with the content. Regular practice, seeking help when needed, and staying consistent will cont
teal.days

teal.days

4281 likes

A handwritten note explaining mixture problems in differential equations, defining rate in/out, and solving an example where a 1000L tank with 100kg sugar is diluted with pure water until only 10kg sugar remains, calculating the time as 460 seconds.
Mixture problem in Differentiable equation
#mathematics #lemon8education #notes
candy

candy

3 likes

A neatly organized study desk features a tablet on a stand displaying a cute wallpaper, a white keyboard, and various stationery. An overlay text reads '4 SECRET APPS FOR 4.0 GPA', introducing study tools.
A visual guide to Gizmo Flashcard, showing its app and web interfaces. It highlights features like spaced repetition, active recall quizzes, and offline mode, noting it might lack depth for complex topics.
An overview of PDFelement, showcasing its mobile and web interfaces for managing PDFs. Features include editing, organizing, AI tools for summarizing, and translation, with a note about limited free features.
Want a 4.0 GPA? These Tools Actually Work
🧠 Gizmo Flashcard Seriously, this thing is my brain's best friend when I need to memorize a ton of stuff. The spaced repetition thingy keeps me from totally burning out, whether I'm cramming Chinese characters or science vocab. Heads up, though: it's not always super in-depth, so I got
emilie.studygram

emilie.studygram

281 likes

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