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(sin(L*((5*x)/2)))'The calculation above is a derivative of the function f (x)
cos(L*((5*x)/2))*(L*((5*x)/2))'
cos(L*((5*x)/2))*((L)'*((5*x)/2)+L*((5*x)/2)')
cos(L*((5*x)/2))*(0*((5*x)/2)+L*((5*x)/2)')
cos(L*((5*x)/2))*(0*((5*x)/2)+L*(((5*x)'*2-(5*x*(2)'))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*((((5)'*x+5*(x)')*2-(5*x*(2)'))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*(((0*x+5*(x)')*2-(5*x*(2)'))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*(((0*x+5*1)*2-(5*x*(2)'))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*((5*2-(5*x*(2)'))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*((5*2-(5*x*0))/(2^2)))
cos(L*((5*x)/2))*(0*((5*x)/2)+L*5/2)
5/2*L*cos(L*((5*x)/2))
(5/2)*L*cos((5*L*x)/2)
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