$\left(\frac{1}{4}n\:+\:4\:\right)^2$
$\left(1-\cos\right)\left(1+\cos\right)\left(1+\cos^2\right)=1$
$16a^2-ab^2$
$\int\sqrt{1+cosx}dx$
$y=x^2-10x+25$
$.\sqrt{9-x^2}\:dy+\:\sqrt{9+y^2}\:dx=0$
$\int\:\frac{x^2}{x^4-2x^2-8}\:dx$
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