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

If : `cos^(2)theta-sin^(2)theta=tan^(2)alpha and costheta*cosalpha=cosbeta, "then" : beta=`

A

`(pi)/(3)`

B

`(pi)/(4)`

C

`(pi)/(5)`

D

`(pi)/(6)`

Text Solution

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The correct Answer is:
B
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