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• 22 Integral with constant u-substitution
• 13 Prove that there are no integers $x$ and $y$ such that $3x^2=13+4y^2$
• 11 Given a matrix $A$ find $A^n$.
• 8 Solution to this Differential Equation $f''(x)=f(x)f'(x)$ needed
• 7 $\tan(z)=i$, no solution
• 7 Solving first order differential equation with power series
• 7 A third order nonlinear ordinary differential equation.
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