$\cos\left(x\right)^2=2-2\sin\left(x\right)$
$7x-6+5-3x+5-2+7x$
$\left(x^3+x^{-1}\right)^3$
$\sec^4\left(x\right)-2\sec^2\left(x\right)+1=\tan^4\left(x\right)$
$\left(x+2xy\right)\:\frac{dy}{dx}-1=0$
$-19.\left(-6-9\right)$
$3v^2-60v=-141$
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