$\frac{y}{e^y}dy=\frac{1}{x^2}dx$
$\int xe^{4x^2+3}dx$
$\sin22.5^{\circ}\cos22.5^{\circ}$
$\left(x+2\right)^4\left(7x-5\right)^3=y$
$\int2\:cot^7\left(2t\right)\:dt$
$2x^2-13x-20=0$
$\int\frac{2}{\left(\sqrt{5+4x-x^2}\right)}dx$
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