$\frac{cosx}{sinx}\left(sec^2x-1\right)$
$f\left(x\right)=\sqrt{\ln\left(-x+2x^{-1}\right)}$
$\:\sqrt{-4}+\sqrt{-49}$
$-6\sin\left(x\right)+3=0$
$x\sqrt{1+y^2}dx=dy$
$c^4+18c^2+\:81$
$\frac{d^2}{dy^2}\left(\ln\left(x^2+y^2\right)\right)$
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