$\int x\sqrt{7+12x}dx$
$4a-4c+a+8c$
$x^2-15x-13$
$\frac{cos^4\left(\theta\:\right)\:\:\:-sin^4\left(\theta\:\right)}{cos^2\left(\theta\:\right)}=1-tan^2\left(\theta\:\right)\:$
$257.856+143.148$
$\sqrt{0.4}<0.66$
$\frac{cos\left(x\right)}{1-sin\left(x\right)}-tan\left(x\right)=cos\left(x\right)$
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