$\tan\left(\frac{x}{2}\right)-\cot\left(\frac{x}{2}\right)=-2cot\left(x\right)$
$x^2+10x+35=0$
$4+2+2+2+2+2+2+2+2$
$9x^2+30x+16$
$2sin4x+\sqrt{3}=0$
$\frac{2}{3}\:\left(6x\:-\:9\right)\:+\:16$
$\left(4x^5\right)^7$
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