$7\:sin\left(2x\right)\:=\:7\:cos\left(x\right)$
$cos^2a\cdot cosb+sen^2a\cdot cosb$
$\:-\:3ad\:-\:\left(-\:2ad\right)\:$
$\int\sqrt{-x^2+49}dx$
$\frac{x^2+2x-3}{a+1}$
$\frac{2}{3}x^4\frac{3}{3}x^2$
$\frac{8a^3b^4}{7ab^{-2}}$
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