$\int_0^{\pi}3\pi^2dx$
$\frac{1+\cos x}{\sin^2x}=\frac{1}{1-\cos x}$
$9x^2-9x-4$
$5d-5$
$f\left(x\right)=xy-xy^2$
$\left(81^2-6s^2\right)+\left(4s^2-21^2+6\right)$
$7+3r<4$
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