Example

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

Question

$$\sin ^ { 2 } A - \cos ^ { 2 } A$$

Evaluate

$-\cos(2A)$

Differentiate w.r.t. A

$2\sin(2A)$

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