$-\left(250-350\right)-\left(1500-750\right)-\left(-2800-1400\right)$
$4x^2+4x+7$
$6\cos\left(x\right)=\csc\left(x\right)$
$12+5\left(2+y\right)$
$\lim_{t\to0}\left(\frac{e^{5t}-1}{sin\left(t\right)}\right)$
$\frac{3x-1}{5}-\frac{1}{2}\left(x+1\right)+\frac{1}{7}x<1$
$cosec^2x+1=3cotx$
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