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## Main Question or Discussion Point

How do I differentiate

f(x,t) = expi(kx-wt)

f'(x,t) = ?

f''(x,t) = ?

f(x,t) = expi(kx-wt)

f'(x,t) = ?

f''(x,t) = ?

- Thread starter j-lee00
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How do I differentiate

f(x,t) = expi(kx-wt)

f'(x,t) = ?

f''(x,t) = ?

f(x,t) = expi(kx-wt)

f'(x,t) = ?

f''(x,t) = ?

cristo

Staff Emeritus

Science Advisor

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Write your expression as exp(ikx).exp(-iwt). Depending upon what you are differentiating with respect to, one of these terms can be treated as a constant. You know how to differentiate exp(x), right?

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Does it make a difference if "i" is involved?

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No .

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