$tan\:cot\:=1$
$\left(14a^3-7b^2+12\right)-\left(5a^3-4b^2+2\right)$
$\:\left(csc\left(x\right)-cot\left(x\right)\right)\cdot\:\left(sec\left(x\right)+1\right)$
$9sec^2\left(9x\right)$
$x^2-9x=36$
$\frac{3sin\left(4x\right)}{sin\left(3x\right)}$
$\frac{2a+3b}{3a-2b}-\frac{3a+2b}{3a-2b}$
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