$\left(4^3.3^2\right)^3$
$2a-2a$
$\frac{90}{x}=\left(-18\right)$
$\left(0.2y+0.9x\right)^2$
$\int\left(2x\left(x^{2\:}+\:1\right)^4\right)dx$
$\cos x\sec x-\cos^2x$
$\left(7xy+11x^4\right)^2$
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