$\lim_{x\to0}\left(\frac{x^2e^2}{cos\:x-1}\right)$
$\frac{y^2dy}{6-y}=xdx$
$\left(1-x-z\right)dx+dz=0$
$7+8a^2-5+7+2a^2-7a^2$
$\int ( 9 ^ { x } + 1 ) ^ { 2 } d x$
$\int x^9\left(4-x^2\right)^{\frac{5}{2}}dx$
$x+14=121$
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