$1-\cos^2e=\sin^2e$
$-2r^2+12r+74=0$
$\left(-2x^3-8x^2+12x+10\right)\left(x+5\right)$
$\int_0^{\pi}\frac{d}{4-3\cos}$
$-53\cdot18$
$\left(2x-1\right)dx=\left(3y-7\right)dy$
$\frac{4x^2+23x+16}{x+5}$
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