Example

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

Question

$$\operatorname { c o s e c } 2 A + \operatorname { c o s e c } 4 A = ( \cot A - C )$$

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