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f(x)=cos(sin(x2))

[u(v)]' = u'(v) * v'

so f'(x) = cos'(sinx(x2)) * sin'(x2) * (x2)'

f'(x) = -sin(sin(x2)) * cos(x2) * 2x = -2x sin(sin(x2)) cos(x2)

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13y ago

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