$sinx-cscx=\frac{-cosx}{sinx}$
$3\sin^2x-\cos^2x=0$
$14+9\left(\frac{1}{3}\right)$
$\frac{x^3}{1-x}$
$2\cos\left(x\right)\sin\left(x\right)^2+2\cos\left(x\right)^3$
$\int arctan\cdot x^{-2}$
$\int\frac{x^4-1}{x^2-1}dx$
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