$\cos^4\left(a\right)-sin^4\left(a\right)$
$\lim_{x\to0}\left(\frac{x}{\left(8x^2+5\right)^{\frac{1}{3}}}\right)$
$\frac{4x^3-3x^2+x+1}{x^2+1}$
$5+2+3+1$
$\lim_{x\to1}\left(\frac{2x-1}{\sqrt{x}-1}\right)$
$6m^2+9m+10$
$x^{10}-y^{10}$
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