$\lim_{x\to+\infty}\cos\left(2\tan\left(x\right)\right)$
$3x+3y+12z=6$
$\int\frac{x^3-x^2}{3x^4-4x^3}dx$
$2sin^2x-5sinx=0$
$\int\left(x^2+3x\right)\left(2x+3\right)dx$
$y+3y\cot\left(3x\right)$
$\lim_{m\to-2}\sqrt{8+m^3}$
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