If sintheta=a/b, then costheta is equal ...

If sin`theta=a/b`, then `costheta` is equal to

A

`b/(sqrt(b^2-a^2))`

B

`b/a`

C

`(sqrt(b^2-a^2))/b`

D

`a/(sqrt(b^2-a^2))`

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The correct Answer is:

C

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