$4\sec\left(x\right)^2$
$7u+2u+10$
$4d^3+16da^2-20df^3$
$\left(x^2-10x+25\right)\left(3x-12\right)$
$\lim_{x\to0}\left(\frac{x-1-e^{x-2}}{1-\cos\left(2\pi x\right)}\right)$
$-3+2\cdot4$
$x\left(1+\cot^{2}x\right)$
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