$2a+4a+a$
$2\cdot\left(-2\right)^2-5+3$
$\left(7w-9a+3v\right)^2$
$\frac{x^2\:-\:60x\:+\:900}{x^2\:-\:50x\:+\:600}$
$cscx=\frac{1+secx}{sinx+tanx}$
$x^2+8x+2$
$y^2+8y\:+7$
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