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(cos(pi*x^2))'The calculation above is a derivative of the function f (x)
-sin(pi*x^2)*(pi*x^2)'
-sin(pi*x^2)*((pi)'*x^2+pi*(x^2)')
-sin(pi*x^2)*(0*x^2+pi*(x^2)')
-sin(pi*x^2)*(0*x^2+pi*2*x^(2-1))
-sin(pi*x^2)*(0*x^2+pi*2*x)
2*pi*x*(-sin(pi*x^2))
-2*pi*x*sin(pi*x^2)
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