$\lim_{x\to0}\left(\frac{sinx}{2^x-1}\right)$
$-4c-2$
$\lim_{x\to-\infty}\left(\sqrt{x^2+3x}-\sqrt{x^2+x}\right)$
$0.25-8y^2+64y^4$
$1=\frac{1}{\csc\left(x\right)^2}+\cos\left(x\right)^2$
$\frac{1}{3}\left(9x-24\right)+x$
$\sqrt[4]{81a^8b^5}$
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