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Lesson
Introduction to Trigonometry — Complete Lesson
?? Trigonometric Ratios
In a right triangle with angle ?:
sin ? = Opposite / Hypotenuse
cos ? = Adjacent / Hypotenuse
tan ? = Opposite / Adjacent = sin ? / cos ?
cos ? = Adjacent / Hypotenuse
tan ? = Opposite / Adjacent = sin ? / cos ?
"Some People Have Curly Brown Hair Through Proper Brushing"
Sin = Perpendicular/Hypotenuse • Cos = Base/Hypotenuse • Tan = Perpendicular/Base
?? Standard Values
| ? | 0° | 30° | 45° | 60° | 90° |
|---|---|---|---|---|---|
| sin ? | 0 | ½ | 1/v2 | v3/2 | 1 |
| cos ? | 1 | v3/2 | 1/v2 | ½ | 0 |
| tan ? | 0 | 1/v3 | 1 | v3 | 8 |
?? Key Identities
sin²? + cos²? = 1
1 + tan²? = sec²?
1 + cot²? = cosec²?
1 + tan²? = sec²?
1 + cot²? = cosec²?
2
MCQ Practice
Trigonometry — MCQ Practice
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