y = cos cos[2sin^2(x^3)] y' = -sin cos[2sin^2(x^3)] * (2 sin^2(x^3))' = -sin cos[2sin^2(x^3)] * 2*2sin(x^3) * cos(x^3) * 3x^2
y = cos[2sin^2(x^3)] y' = -sin[2sin^2(x^3)] * (2 sin^2(x^3))' = -sin[2sin^2(x^3)] * 2*2sin(x^3) * cos(x^3) * 3x^2
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