$2\left(4z+2\right)+2\left(5z-2\right)$
$\left(1+x^2\right)-4x^2-7$
$\left(4x-\frac{3}{4}\right)\left(4x+\frac{3}{4}\right)$
$2\cos\left(x\right)-\cos\left(3x\right)-\cos\left(3x\right)+\cos\left(x\right)$
$9^2-169$
$3a^2\:+\:4a\:-4$
$\int z^{12}dz$
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