$\int\frac{3}{x^4+2x^3+x^2}dx$
$2sin^2\left(x\right)=6cos^2\left(x\right)$
$x=\left(25-y\right)$
$y=2x+2x+a-1-b$
$\int e^{5t}\cdot\cos\left(4t\right)dt$
$\left(2a^2-6a\right)^3$
$x\:2\:y\:+\:x$
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