$4\left(x^2+y^2\right)dx+4xydy=0$
$\left(\sec\left(a\right)+\tan\left(a\right)\right)\left(1-\sin\left(a\right)\right)$
$\frac{4}{5}-x^2.8x^3-5x+3$
$\left(7a+2\right)^2$
$\left(9^4\right)^6$
$-\left(-3x^2+4x-2\right)$
$2^{-4}.2^2=a^b=c$
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