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(6*sin(x-y))'The calculation above is a derivative of the function f (x)
(6)'*sin(x-y)+6*(sin(x-y))'
0*sin(x-y)+6*(sin(x-y))'
0*sin(x-y)+6*cos(x-y)*(x-y)'
0*sin(x-y)+6*cos(x-y)*((x)'+(-y)')
0*sin(x-y)+6*cos(x-y)*((-y)'+1)
0*sin(x-y)+6*(0+1)*cos(x-y)
0*sin(x-y)+6*1*cos(x-y)
0*sin(x-y)+6*cos(x-y)
6*cos(x-y)
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