can someone solve this ?

Question

1+tgx / 1-tgx

final result should be

2 / 1-sin2x

Thanx

Answer 1

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Is tgx something like tan x?

If so, then I'd multiply top and bottom by cos x.

That gives (cos + sin)/(cos - sin)

Multiply top and bottom by (cos - sin) gives the denominator you want, but doesn't seem to give the numerator you want. Hmm ...