Evaluate sin2A, cos2A and tan2A if: i)...

Evaluate `sin2A, cos2A` and `tan2A` if:
i) `sinA=5/13`, ii) `cosA=8/17`, iii) `tanA=4/3`

Text Solution

Verified by Experts

i) `sin2A=120/169, cos2A=119/169, tan2A=120/119`, ii) `sin2A=240/289, cos2A=-161/289, tan2A=-240/16`
iiii) `sin2A=24/25, cos2A=-7/25, tan2A=-24/7`

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Knowledge Check

If sinA, cosA and tanA are in G.P., then cos^(3)A+cos^(2)A=?

A

1

B

2

C

3

D

4

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B

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C

4

D

none

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A

sin4A

B

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C

`1/4 sin4A`

D

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