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