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Mathematics: Trigonometric

Amar Singh

11/01/2018 0 0

1. ( sinA )2 + (cosA)2 = 1

2. (tanA)2 + (cotA)2 = 1

3. SinA = 1 /cosecA

4. CosA = 1 /secA

5. TanA = 1/cotA (also inverse as secA= 1/ CosA)

6. sin2a = 2 sinA CosA

7. cos2a = (cosa)2 - (sina)2

= 2(cosa)2 - 1

= 1 - 2 (sina)2

8. tan2a = 2tana / 1- (Tana)2.

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