Example

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

Question

$$\tan A+ \cot A=$$

Evaluate

$\frac{2}{\sin(2A)}$

Differentiate w.r.t. A

$-\frac{4\cot(2A)}{\sin(2A)}$

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