$\frac{1-\cos^2x}{\sec^2x-1}=\cos^2x$
$\frac{\sin2a-\cos2a+1}{\sin2a+\cos2a+1}=\tan a$
$a^2+2a-3$
$\left(2a+2b-1\right)\left(a+2b+1\right)$
$\left(3x^2-7x+5\right)\cdot\left(x^2-x\right)$
$z^2+z^2+3z-z^2$
$3x+6\le27$
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