$\left(\frac{x}{2}-y\right)\:\left(\frac{x}{2}+y\right)$
$\frac{\sec\left(z\right)}{\cos\left(z\right)}$
$\frac{2x+6}{x^2+8x+15}$
$\left(-x-a\right)$
$0.25x^2-10x+800$
$\int\frac{\sqrt{\left(9x^2+25\right)}}{3x}dx$
$\int_0^{\pi}\left(4cos^4x\right)dx$
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