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Trigonometry
> Trigonometrical Identities
Trigonometrical Identities
Introduction
The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant.
Some Trigonometrical Identities
1. sin A = cos (90
o
- A).
2. sin A / cos a = tan A.
3. tan A x tan (90
o
- A) = 1.
4. sin
2
A + cos
2
A = 1.
5. 1 + tan
2
A = sec
2
A.
6. 1 + cot
2
A = cosec
2
A. Where 'A' is the angle.
Summary
i. The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant.
ii. sin A = cos (90
o
- A).
iii. sin A / cos a = tan A.
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Trigonometrical Identities
Introduction
Some Trigonometrical Identities
Summary
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