$\frac{3cos^2\left(x\right)+5cos\left(x\right)+2}{cos^2\left(x\right)+2cos\left(x\right)+1}$
$20n^2-45n$
$5x-4\left(x+2y\right)+9y-7x$
$\int\left(3x-1\right)^4\cdot2xdx$
$\int3x^2\left(4+x^3\right)^{19}dx$
$\int_1^x\left(3x+1\right)dx$
$\lim_{x\to0}\frac{2x+x^2}{x\left(x-1\right)}$
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