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((1/4)*cos(x/4))'The calculation above is a derivative of the function f (x)
(1/4)'*cos(x/4)+(1/4)*(cos(x/4))'
0*cos(x/4)+(1/4)*(cos(x/4))'
0*cos(x/4)+(1/4)*-sin(x/4)*(x/4)'
0*cos(x/4)+(1/4)*-sin(x/4)*(((x)'*4-(x*(4)'))/(4^2))
0*cos(x/4)+(1/4)*-sin(x/4)*((1*4-(x*(4)'))/(4^2))
0*cos(x/4)+(1/4)*-sin(x/4)*((1*4-(x*0))/(4^2))
0*cos(x/4)+(1/4)*1/4*(-sin(x/4))
0*cos(x/4)+(1/4)*-1/4*sin(x/4)
(-1/16)*sin(x/4)
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