$\left(-22-6\right):\left(-25+11\right)$
$\cos^2a=\frac{1}{1+\tan^2a}$
$\lim_{x\to0}\frac{\sqrt{t^2+4}-2}{t^2}$
$z=\left(x+a\right)\left(y+b\right)$
$\frac{dy}{dx}+2y=\frac{x^{-1}+x^3}{e^{2x}}$
$p+\frac{3}{2}y\right)^{2}$
$1^{-4.5}$
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