$\lim_{x\to+\infty}\left(\sqrt{x^2+2x+4}-x\right)$
$4y^8\:+\:36y^7\:+\:81y^6$
$\left(4xy-\frac{1}{3}\right)\cdot\left(5x\right)$
$16a^2-24ab+9bx-3\left(6x+5\right)=4x+9\left(2x+11\right)$
$\int\:\tan\:^2\left(3x\right)\sec\:\left(3x\right)dx$
$4\left(j+3\right)$
$12+\left(-12\right)+\left[90\right]^2$
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