$c^4-13c^2+36+0$
$tan^2\left(a\right)+tan^2\left(b\right)=1$
$n^2=-8$
$\lim_{x\to1}\left(\frac{3x^4-4x^3+5}{\left(x+1\right)^2}\right)$
$\csc^{2}\theta\cdot\tan^{2}\theta-1=\tan^{2}\theta$
$81^4-126^2+49$
$\int_0^{\infty}\left(sinx\sqrt{1+cosx}\right)dx$
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