$-6561-15309$
$-5\cdot\left(3-2\right)+4\cdot\left(-2+6\right)-\left(-4\right)\cdot\left(+6\right)$
$\left(-4\right)\left(20\right)\left(3\right)$
$\lim_{x\to\frac{\pi}{4}}\left(1-tan\left(x\right)\right)\cdot sec\left(2x\right)$
$-2x+16>0$
$a^2=9$
$1+2\left(2\right)-3\left(-2\right)$
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