$\cos-x^2$
$cos3x=\frac{\sqrt{3}}{2}$
$\left(7n-5\right)^3$
$\cos\left(t\right)-\sin\left(2t\right)=0$
$|-26|+|-17|$
$\frac{dy}{dx}=\frac{-x}{y+1}$
$\left(\frac{\cos\left(x\right)}{\frac{1}{\sin\left(x\right)}}\right)+\frac{\cos\left(x\right)\left(\frac{\cos\left(x\right)}{sin\left(x\right)}\right)}{\frac{1}{sin\left(x\right)}}$
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