$4y-6y-4y$
$\lim_{x\to1}\left(\frac{1}{sin\left(x\right)}-\frac{1}{x}\right)$
$\frac{\left(-a^{-2}b^3\right)^2}{a^2b^2\left(2a^{-1}b\right)^2}$
$\lim_{x\to\infty}\left(\left(2x^2+x+1\right)e^x\right)$
$-\left(\frac{-14}{2}\right)^{2}$
$5cos^2x-4$
$15=10a-7a$
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