$\frac { 7 a } { a }$
$\left(4u^3+5t^2\right)^3$
$4\frac{x^3-3x^2+2x+4}{x-7}$
$\int\left(\frac{d}{\left(\cos^2\left(f\right)\right)\sqrt{1+\tan\left(f\right)}}\right)$
$\log_{15}\left(u\right)=1$
$\left(\frac{x^3}{3}-x^2+x\right)$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{\left(e^{2x}-1\right)^2}\right)$
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