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(2*cos(x-(pi/6)))'The calculation above is a derivative of the function f (x)
(2)'*cos(x-(pi/6))+2*(cos(x-(pi/6)))'
0*cos(x-(pi/6))+2*(cos(x-(pi/6)))'
0*cos(x-(pi/6))+2*-sin(x-(pi/6))*(x-(pi/6))'
0*cos(x-(pi/6))+2*-sin(x-(pi/6))*((x)'+(-(pi/6))')
0*cos(x-(pi/6))+2*((-(pi/6))'+1)*(-sin(x-(pi/6)))
0*cos(x-(pi/6))+2*1*(-sin(x-(pi/6)))
0*cos(x-(pi/6))+2*(-sin(x-(pi/6)))
-2*sin(x-(pi/6))
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