$4c-20cd+25d^2$
$\frac{4\left(-2\right)+6\left(-2\right)\left(-3\right)}{-2^2-3}$
$\sqrt{x+60}=\sqrt{x}+2\sqrt{x+5}$
$a^4+2a^2+9$
$49a^2-14ab+b^2$
$\frac{\sec\left(x\right)^2}{2}$
$2x^2-13x+15$
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