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Question Number 11403 by JAZAR last updated on 24/Mar/17
how can demonstred that   cos(2x)−sin(2x)−1=−cos^2 x
howcandemonstredthatcos(2x)sin(2x)1=cos2x
Commented by sm3l2996 last updated on 24/Mar/17
I think that equation is not correct  because cos(2π)−sin(2π)−1=0≠−cos^2 (π)
Ithinkthatequationisnotcorrectbecausecos(2π)sin(2π)1=0cos2(π)

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