$3a^4+a^3+15a+5$
$\frac{1-\cos^2x}{\sec^2x-1}=\cos^2x$
$y^2+6y+9=0$
$4x^2-81y^2$
$m+1\:\:\:\:\:\:\:m-4$
$\left(-5\right)+\left(-4\right)\cdot\left(+8\right)-\left(-15\right)$
$^{-3=625}$
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