$ay\:dx+\:bx\:dy=0$
$-89-\left(-89\right)$
$2\cos^2x-5\cos x+2$
$a3-5a+1\:entre\:a+2$
$-6cos^2x$
$-3x^2+3x$
$\frac{\sin2x\sin x}{2\cos x}+\cos^2x=1$
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