$\frac{dy}{dx}=\frac{-0.3}{cos\left(y\right)}$
$2ax+2ax-3ax$
$4m^4-81m^2$
$\sin x\left(\sec x+\csc x\right)=\tan x+1$
$6a\left(x+y^2\right)-9b\left(x+y^2\right)+3c\left(x+y^2\right)$
$x-6=18-7x$
$\left(sen\:t-tcos\:t\right)^2$
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