~DiferensiaL
f(x) = - ( cos²x - sin²x )
f(x) = - cos²x + sin²x
f'(x) = -(-2 cos x . sin x) + 2 sin x . cos x
f'(x) = sin 2x + sin 2x
f'(x) = 2 sin 2x
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~DiferensiaL
f(x) = - ( cos²x - sin²x )
f(x) = - cos²x + sin²x
f'(x) = -(-2 cos x . sin x) + 2 sin x . cos x
f'(x) = sin 2x + sin 2x
f'(x) = 2 sin 2x