$3\sec^2x-2\tan^2x-4=0$
$5x^2-2x-8$
$16r^2+40r+25$
$\frac{d}{dt}\sqrt{t}e^{\sqrt{t}}$
$\sqrt{x}+1=\sqrt{x+9}$
$\cos^2a+3\sin+2$
$16x^2+9y^2-96x=-288$
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