Example

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

Question

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

Evaluate

$\cos(2\theta )$

Differentiate w.r.t. θ

$-2\sin(2\theta )$

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