If tan theta+sin theta=m and tan theta-s...

If `tan theta+sin theta=m` and `tan theta-sin theta=n ,` then `m^2-n^2is .... (a)4m n` (b) `m^2+n^2=4m n` (c)m^2-n^2=m^2+n^2` (d) `m^2-n^2=4sqrt(m n)`

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