$\lim_{x\to\pi}\left(\tan\left(x\right)^{\sin\left(x\right)}\right)$
$4\:x\:9,1$
$r^2-8r-12$
$-3x^2+2xy+1y^2$
$\int_0^{\pi}\cos^4\left(2x\right)dx$
$10d-2fd-3d$
$-7a-3b+2a+4b$
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