$\left(\frac{y}{5}\right)^4$
$28x+28$
$\frac{x^3+3}{2x^2+2}$
$4x^2-20x=\:8x-40$
$\left(5a^2-3\right)\left(5a^3+3\right)$
$2\cos^2a=2\cos a$
$7\sin^2$
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