$\left(1-\cos\left(x\right)\right)\left(1+\cot^2\left(x\right)\right)=1$
$a-2b;a=-1,b=0$
$7n\left(2m^2+m\right)$
$2w^2-14w=-12$
$15\cdot\sin^2\left(x\right)-17\cdot\sin\left(x\right)+4=0$
$-1+-11$
$-\frac{60}{15}$
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