$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{\left(e^{2x}\right)-1}\right)$
$x^5-9x^4+33x^3-61x^2ax-20$
$\left(sinx+cosx\right)\left(secx+cscx\right)$
$3y^2+14x=4x^2$
$a^3b^2\cdot a^5b^{12}$
$2x^2+28x+196$
$\frac{16x}{4x}$
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