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$\begingroup$

I would like to know how differentiate this equation it should be fairly simple but its been a long night and I cant seem to figure it out.

$r =\frac{f}{R . \hat z} R$

with respect to time.

  • f is some constant (focal length)
  • R is a position vector
  • $R . \hat z $ is inner product

Any help will be appreciated

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    Did you mean $\frac{f}{R.z\hat R}$? You get this as `$\frac{f}{R.z\hat R}$`.2012-10-24
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    Please edit your question to make it more readable.2012-10-24
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    I'm guessing it should be $R (\hat z \cdot R)$.2012-10-24
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    sorry about that, it has now been correctly formatted2012-10-24
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    Does $\hat{z}$ depends on time?2012-10-24
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    $\hat z $ is actually just a unit vector in a specific direction (z-axis), R is a position vector2012-10-24

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