If cottheta = 7/8, evaluate: - ((1+sinth...

If `cottheta = 7/8,` evaluate: -` ((1+sintheta)(1-sintheta))/((1-costheta)(1+costheta))`

A

`frac(64)(49)`

B

`frac(81)(64)`

C

`frac(49)(64)`

D

`frac(49)(81)`

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