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Class 12 Tuition > Learn Class 11 > Mathematics: Trigonometric
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Mathematics: Trigonometric

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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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