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Choose the correct statement :...

Choose the correct statement :

A

the principal value of`sin^-1 (1/2) is pi/3`

B

`cos(A-B)=cosA-cosB`

C

`sin2theta =2sinthetacostheta`

D

`1-tan^2 theta =sec^2 theta`

Text Solution

Verified by Experts

The correct Answer is:
C
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