$\lim_{x\to4}\left(\frac{x^2-8x+15}{x^2-7x+12}\right)$
$\lim_{x\to0}\left(\frac{x}{ctg\left(x\right)}\right)$
$\int5tsec^2\left(t\right)dt$
$\int x^7\left(3+11x^8\right)^{11}dx$
$2x-3x-3+4x^2+10+x$
$\left(2x\right)\left(8x+7\right)$
$32+y=15$
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