$\int\frac{3+7.\cos^2x}{1+cos\:2x}dx$
$\left(-13\:000\right)\:-\:6500$
$4ab-6ab+12ad$
$\int\frac{1}{y\sqrt{49-y^2}}dy$
$6y-5=7$
$32x^4-8$
$1-\left(2x-3\right)^2$
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