$3\left(15+6x\right)-\left(25x+10\right)$
$\int\frac{1}{\sqrt{4-49x^2}}dx$
$\lim\:_{n\to\:\infty\:\:}\left(\frac{\sqrt{n+1}}{3n+1}\right)$
$\left(1-\cos^2x\right)\cot\left(x\right)$
$-18=-9u$
$7x-10x-9x$
$\left(i-1\right)\frac{3}{5}$
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