$20+90+51bc32xyb$
$3x\:-\:4x\:-\:2x\:-\:7y$
$\int_{-1}^{\infty}e^{-x}dx$
$36b^8+48b^4+16$
$4b^2+6b+9b$
$4\sin^2\left(\frac{x}{2}\right)\:-sen\:\left(2x\right)\tan\left(x\right)=1-cos\:\left(2x\right)$
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