Let (y = cos^2x)
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Then, (y = (cos x)^2)
Using the chain rule,
(dy/dx = 2(cos x)(-sin x))
(dy/dx = -2(cos x)(sin x))
Therefore, the derivative of (cos^2x) is (-2(cos x)(sin x)).
Let (y = cos^2x)
Sorry, login/register first to answer this test.
Then, (y = (cos x)^2)
Using the chain rule,
(dy/dx = 2(cos x)(-sin x))
(dy/dx = -2(cos x)(sin x))
Therefore, the derivative of (cos^2x) is (-2(cos x)(sin x)).