$\left(a-1\right)\left(b-2\right)=15$
$x^5-2x^4-16x+32$
$-7c=-6-10c$
$\frac{cosx-sinx}{\frac{1}{sinx}-\frac{1}{cosx}}$
$\sec\left(x\right)^2\cdot\cot\left(x\right)-\cot\left(x\right)$
$8^68^2$
$y'=\sqrt{1-4x}$
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