$\frac{\tan\left(a\right)\sin\left(a\right)}{\sec\left(a\right)^2-1}=\sin\left(a\right)\cot\left(a\right)$
$\left(3a\right)^6-256$
$5xy^3+x^3y^6-8x^2y^5$
$\int6sin6scos\:dx$
$\int\sin\left(x\right)\sqrt[3]{4+6\cos\left(x\right)}dx$
$\left(x^2+2xh+h^2-1\right)\left(x^2-1\right)$
$-\left(4+\right)\left(3^2-6\right)$
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