$\lim_{x\to\infty}\:\frac{7\sqrt{4n^2+21}\:\left(n+1\right)}{2}$
$\sqrt{5x}.\sqrt{49x}$
$\sin\left(x\right)=10$
$2b+2=3+b$
$-\left(2ax-8y-2\right)$
$x^4+x^3+x^2$
$\lim_{n\to\infty}\left(\frac{1}{2}r^2n\cdot\sin\left(\frac{360}{n}\right)\right)$
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