$\sin^2a+\cos a+1=0$
$\left(7x^{3}y^{2}\right)\left(4xy\right)\left(-2y\right)$
$\frac{3+2x-8x^2}{4+5x-6x^2}$
$\left(8+x^4\right)\left(8-x^4\right)$
$a^2+6a-64$
$2ab-5ab+4ab-6ab$
$\int\left(sin^7x+4sin^2x-sinx\right)cosx\:dx$
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