Anonymous asked in Science & MathematicsMathematics · 1 decade ago

can someone solve this ?

1+tgx / 1-tgx

final result should be

2 / 1-sin2x


1 Answer

  • 1 decade ago
    Favorite Answer

    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 ...

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