$\cos2x\cdot\csc x+\csc x+\cot x=0$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{1-tan\left(x\right)}{4x-\pi}\right)$
$y=\left(-2x^2-x\right)\frac{1}{x}$
$\int\left(f+4\right)^5df$
$2xy-x-y,\:x=0,\:y=0$
$-15-9+2+7-13$
$a^2-18a+22$
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