Example

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

Question

$$\cos ^ { 2 } 3 x$$

Evaluate

$\left(\cos(3x)\right)^{2}$

Differentiate w.r.t. x

$-3\sin(6x)$

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