I need to prove
sin2x−tan2x=−sin2xtan2x
I tried simplifying
sin2x=2sinxcosx;tan2x=2tanx1−tan2x.
But it's so long and complicated that I feel I must've made a colossal mistake somewhere, or I am not using the correct equivalence. Or maybe I made a huge oversight from the beginning, and I don't need to simplify them in the first place.
Either way, i am stuck. Please help. Thanks.
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