$27xy-81x+21y-63$
$\sin^4\left(a\right)-\cos^4\left(a\right)-1-2\:\cos^2\left(a\right)$
$\left(+11\right)+\left(-71\right)-\left(-59\right)$
$\left(-3^2\right)+\left(\frac{1}{3}\right)^{-1}$
$17x^5-51x^4+34x$
$\frac{4x}{2x}$
$0.6\cdot0.12$
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