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alpha, beta, gamma, delta are angles in ...

`alpha, beta, gamma, delta` are angles in I, II, III and IV quadrant respectively and no one of them is an integral multiple of `pi//2`. They form an increasing arithmetic progression.
Which of the following does not hold

A

`sin(beta+gamma)=sin(alpha+delta)`

B

`sin(beta-gamma)=sin(alpha-delta)`

C

`tan2(alpha-beta)=tan(beta-delta)`

D

`cos(alpha+gamma)=cos2beta`

Text Solution

Verified by Experts

The correct Answer is:
B
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