$\left(25:-5\right)$
$\frac{8cos\left(2t\right)}{cos\left(t\right)+sin\left(t\right)}$
$500\cdot\left(-4\right)$
$\lim_{x\to-1}\left(\frac{x^2-2x-3}{x^2+4x+3}\right)$
$49x^2-9$
$\sin\left(x+270\right)=-\cos\left(x\right)$
$z=e^x\tan\left(y\right)$
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