$\cot\left(a\right)+1=0$
$2\int\sin^42x\cos^32xdx$
$-3x^3-6x^2+3x+6$
$\frac{8}{9}x-\frac{8}{7}\le6$
$2\cdot2\cdot2$
$\int_{-2}^2\left(\frac{1}{1+x^2}\right)dx$
$\left(t^2-12t+11\right)\frac{dy}{dx}=y$
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