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If sin^2 alpha+ sin^2 beta=2, then the v...

If `sin^2 alpha+ sin^2 beta=2`, then the value of `(cos frac (alpha+beta)(2))` is -
यदि `sin^2 alpha+ sin^2 beta=2`,तो `(cos frac (alpha+beta)(2))` का मान है-

A

A)1

B

B)`-1`

C

C)0

D

D)0.5

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CHAMPION PUBLICATION-2011 TIER-II PAPER(23)-EXERCISE
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