$y^2+4y+49$
$1+5v+v$
$20+90+51zc$
$15-\left(4+\left(-5-4+\left(2-3\right)\right)-16\right)$
$1575\cdot55$
$2y^4-32y^2$
$\left(1-\cos\:^2\:x\right)\left(1+\tan\:^2x\right)$
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