Example

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

Question

$$\displaystyle\frac{d}{d x } \left( \frac{ \sqrt{ 1- \cos x } }{ 2 } \right)$$

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