$cos^2x-\cos\left(x\right)+1=\sin^2\left(x\right)$
$x-6\sqrt{x^2}+5x-66$
$\int\frac{\sin^2\left(4x\right)}{\cos^4\left(4x\right)}dx$
$\int-\frac{8\left(x\right)}{\sqrt{25-x^2}}dx$
$\left(\sqrt{\left(4-x\right)}\right)^5$
$4^9\:.\:4^{-2}$
$\int\frac{2x-5}{3x^2+4x-2}dx$
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