$1-\int9\sqrt{16-25x^{2}}dx$
$x^2+2y^2=13k^2$
$\cos\left(x-180\right)=-\cos\left(x\right)$
$\left(c\:\:+\:\:7\right)\:\left(c\:\:-\:\:8\right)$
$y^2-6y+4$
$x^2+4x\:>3$
$6a+12b$
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