1.

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

Answer»

`sin(beta+gamma)=sin(alpha+delta)`
`sin(beta-gamma)=sin(alpha-delta)`
`TAN2(alpha-beta)=TAN(beta-delta)`
`cos(alpha+gamma)=COS2BETA`

Answer :B


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