$\frac{cot\:a-1}{cot\:a+1}$
$\int\left(45cos\left(2t\right)e^{15t}\right)dt$
$y\sqrt{2x+1}\frac{dy}{dx}-y^2=0$
$23-15+2-8$
$\left(a+h\right)^3$
$\frac{dy}{dx}+\sqrt{1+x^2}y=0$
$i=prt$
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