$\tan\left(4x\right)=-\tan\left(2x\right)$
$\frac{dy}{dx}\left(x+xy\right)+y=0$
$\frac{csc\left(x\right)\:cos\left(x\right)\:}{tan\left(x\right)+cot\left(x\right)}=cos^2\left(x\right)$
$\int_1^{\infty}\left(sin^2x\right)\:dx$
$3\tan\:x=\sqrt{3}$
$9x^2-18x-16$
$x+10=9$
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