$5\cos^2=4-3\sin^2$
$\left(2x-\sqrt{y}\right).\:\left(2x+\sqrt{y}\right)$
$2x+1\:+\:2x-1\:area$
$a+b+ab;\:a=1;\:b=-1$
$\frac{y}{x^2}=10$
$x^2yz+3xy^2z-2xyz^2-3xy^2z-x^2yz$
$-9\:x\:-6$
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