$\lim_{x\to1}\left(\frac{ln\:x}{x^3-1}\right)$
$\left(7x^2+2b^3\right)\left(-7x^2+2b^3\right)$
$100-25x^2$
$\int_0^2\left(e^{-st}2t^2\right)dt$
$1-\cot^4a=2\csc^2a-\csc^4a$
$\frac { 5 x ^ { 3 } - 3 x ^ { 2 } - 20 x + 12 } { 5 x - 3 }$
$6=\frac{x}{5}$
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