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