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d/dx (25*sin(1.3258)(x/(2*25*cos(1.3258))) - 1/2*9.8*(x/(2*25*cos(1.3258)))^2) , x=60/4
d/dx (25*sin(1.3258)(x/(2*25*cos(1.3258))) - 1/2*9.8*(x/(2*25*cos(1.3258)))^2) , x=60/4
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