$1-\sin\left(x\right)+\sin^4\left(x\right)=\cos^4\left(x\right)$
$\frac{d}{dx}\left(2\cos^2\left(x^2+2\right)\right)$
$2\sqrt{1}$
$x+\left(-x-1\right)+3x-\left(-x+1\right)$
$\frac{12x^2y^2z}{18xyz}$
$a^5.\:a^3\:=a^{15}$
$-3\cos\left(x\right)+3=\cos\left(x\right)+5$
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