$\left(secx\right)\left(\frac{cotx}{sinx}\right)=csc^2x$
$x2\:+\:6x+\:81=0$
$\int x^2\sqrt{5+4x-x^2}dx$
$x^2+4x-7=0$
$-24\:-\:\left(-13\right)\:-\:\left(4\right)$
$\left[2\left(x+2\right)^2-3\right]-\left[2\left(x-2\right)^2-3\right]=64$
$a^2-a^4+a^6-a^8$
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