$\frac{\sec\left(a\right)}{\tan\left(a\right)}=\csc\left(a\right)$
$\:6=\frac{k\\:+\\:5}{2}\:$
$25x^5+50x^3-100x^4$
$\sin^3\left(x\right)\:+\sin^2\left(x\right)$
$\int\left(4+x^2\right)^{-6}dx$
$\left(v-8\right)\left(v+10\right)$
$250-2x^2$
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