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If cos^(2)theta-sin^(2)theta=tan^(2)alph...

If `cos^(2)theta-sin^(2)theta=tan^(2)alpha,` `"then" : sqrt2 * cos theta * cos alpha=....` A) `sin theta * sin alpha`B)1 C)`tan^(2)theta` D)none of these

A

`sin theta * sin alpha`

B

1

C

`tan^(2)theta`

D

none of these

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