$-a^8b^9c^4+8c^4$
$a+b=\frac{\pi}{2}$
$\left(+16\right)-\left(-8\right)-\left(-3\right)-\left(-1\right)$
$\left(2x^2-3y^2\right)^5$
$\lim_{x\to0}\left(\frac{cn\cdot\cos\left(2x\right)}{7x^2}\right)$
$\frac{1}{seca-1}+\frac{1}{seca+1}=2coseca\cdot ctga$
$4x^2+36x^4-6x^3$
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