Example

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

Question

$$5 \cos 5 \times 6 \theta 3$$

Evaluate

$5\cos(30\theta _{3})$

Differentiate w.r.t. θ_3

$-150\sin(30\theta _{3})$

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