$25-40y^2$
$\left(e+f\right)^7$
$-\frac{250mn2q}{-50q}$
$\left(x^{2}+5\right)^{2}$
$7y-5y+4$
$\frac{\cos^2\left(a\right)}{1-\sin\left(a\right)}-1=\sin\left(a\right)$
$\frac{2x-3}{2x+2}$
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