sintheta/(1-cottheta)+costheta/(1-tanthe...

`sintheta/(1-cottheta)+costheta/(1-tantheta)=`

A

`4/3` or `(2m)/(m^2-1)`

B

`3/4` or `(2m)/(m^2+1)`

C

`4/3` or `(2m+1)/(m^2)`

D

`3/4` or `(m^2)/(2m+1)`

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