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Help anyone? I need both sides to equal.

-2sinxcosx/ 1-sinx-cosx = 1+sinx+cosx

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multiply the top and bottom of the left side by
1 + sinx + cosx

leave the top alone, but expand the bottom

at the bottom you will end up with -2sinxcosx which will cancel with the same at the top, leaving you
with 1+sinx+cosx which is RS

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