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If cosh beta= secalphacos theta,sin h be...

If `cosh beta= secalphacos theta,sin h beta = " cosec "alphasin theta," then "sinh^(2)beta=`

A

`sin alpha cos alpha`

B

`cos^(2)alpha`

C

`cos^(2)alpha`

D

`sin alpha + cos alpha`

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The correct Answer is:
C
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