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• 22 Integral with constant u-substitution
• 13 Prove that there are no integers $x$ and $y$ such that $3x^2=13+4y^2$
• 13 Given a matrix $A$ find $A^n$.
• 9 $\tan(z)=i$, no solution
• 8 Interesting way to evaluate $ \int \cos^3 x\ dx$
• 8 Solution to this Differential Equation $f''(x)=f(x)f'(x)$ needed
• 7 Explanation about nonhomogeneous equations
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