cameronrai98
cameronrai98
11-05-2017
Mathematics
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Cos2x/cos^2x*sin^2x dx
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Аноним
Аноним
11-05-2017
the correct answer is
We use this Formula : cos(A + B) = cos A cos B − sin A sin B. Letting A = B = x, we get, cos(x + x) = cos x ⋅ cos x − sin x ⋅ sin x ∴ cos 2x = cos 2 x − sin 2 x, or, sin 2 x + cos 2x = cos 2 x
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