$cos\left(2a+2b\right)-cos\left(2a\right)$
$x^2+124x+49$
$\frac{y}{x^2}=10$
$\frac{5-2x}{3x-9}<1$
$3x^3+4x^2-5x-2$
$\left(\frac{1}{2}x\:+\frac{1}{4}\:\right)\:\left(\frac{1}{2}x\:-\frac{1}{4}\right)$
$-15z\:=-225$
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