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If theta is an acute angle such that tan...

If `theta` is an acute angle such that `tan^2theta=8/7` , then the value of `((1+sintheta)(1-sintheta))/((1+costheta)(1-costheta)` is (a) `7/8` (b) `8/7` (c) `7/4` (d) `(64)/(49)`

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