$-a+4a$
$\left[5-3\left(a+b\right)\right]^2\:\left[5-3\left(a+b\right)\right]^2$
$3x^2y-2xy^2;\:x=-2;\:y=3$
$\frac{1-\tan^2\left(a\right)}{1+\tan^2\left(a\right)}+1$
$\left(2r.senx-cosx\right)^2+r^2\left(cos^2x-sen^2x\right)^2$
$256a^12-289b^4\:m^10$
$-16v^2+72>25$
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