$\cot\left(-x\right)\sin^2\left(x\right)\sec\left(x\right)=-\sin\left(x\right)$
$\lim_{x\to\infty}\left(-ax\right)$
$10p+50p-5p-7$
$\frac{12x^4y^5-8x^3y^5}{6x^2}$
$9x+24x+16$
$a^2-8a+7$
$z=ln\left(x+y\right),\:x=t\:y=t$
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