$\cos2a\:-\:cos\:6a$
$x^2+y^2+1=0$
$1-m^2$
$\left(-5\right)\cdot\left|\left(-17\right)-\left(-19\right)\right|+12+\left(-1\right)$
$\frac{\left(-3x^2+2x-1\right)}{x+1}$
$\int\:\:24x^3cos\left(x^4\right)dx$
$\left(\frac{3}{4}w^5+5m^3\right)\left(\frac{3}{4}w^5-5m^3\right)$
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