Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac{1}{\tan\ A}-\frac{1}{\tan\ 2A}=\frac{1}{\sin\ 2A}$$

Solve for A

$A\neq \frac{\pi n_{1}}{4}$
$\forall n_{1}\in \mathrm{Z}$

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