$\left|2x+3\right|4-2x$
$\left(2m^x+n^y\right)^3$
$x^2-13x-30=0$
$\left(2x^3-3x^2+4x-2\right)-\left(3x^2-5x+5\right)$
$2\sin\left(4x\right)=-2$
$4\sin\left(x\right)=6\cot\left(x\right)$
$\frac{\tan^2\left(u\right)}{\sec\left(u\right)-1}$
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