derivative of cos(x/2)

Question

solomonzelman · Answer

you will need to use the chain rule, for $\large\color{black}{ \frac{\LARGE x}{\LARGE 2}                    }$ .

I hope you know the derivative of just a, $\large\color{black}{ \cos(x)}$,
and know that $\large\color{black}{ \frac{\LARGE x}{\LARGE 2}  }$ is same as,  $\large\color{black}{ x\frac{\LARGE 1}{\LARGE 2}                    }$ .

solomonzelman · Answer

if you got any questions or concerns, you are free to ask....

solomonzelman · Answer

You don't need any more help? can you just in case tell me what you got?

anonymous · Answer

Thank You, The derivative of cosx is -sinx so I just need to apply the chain rule to that part of the equation to solve it.

solomonzelman · Answer

yes, you just need to apply the chain rule for the (x/2)

solomonzelman · Answer

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