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If sintheta=a/b, then costheta = ………….....

If `sintheta=a/b`, then `costheta` = …………..

A

`(a)/sqrt(b^2+1)`

B

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

C

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

D

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

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