Example

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

Question

$$\sin ^ { 4 } x - \cos ^ { 4 } x$$

Evaluate

$-\cos(2x)$

Differentiate w.r.t. x

$2\sin(2x)$

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