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• 9 Why are they called "first integrals"?
• 9 How do Integral Transforms work
• 7 Derivative of $\int_0^tf(x,t)dx$?
• 6 The Brachistochrone Problem
• 6 solve for $(\cos x)(\cos2x)(\cos3x)=\frac{1}{4}$
• 5 Solve this differential equation $\Biggr(\frac{dy}{dx} -1\Bigg)\Bigg(y-x\frac{dy}{dx}\Bigg)=\frac{dy}{dx}$
• 5 Transform the partial differential equation with new independent variables
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