How to write this ((1/c)**(-3/2)+cos(radians(d))*c) in Wolfram|Alpha?

Questions
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1

Hi,

I am trying ((1/c)**(-3/2)+cos(radians(d))*c) in Wolfram Alpha through Mathemtica.

  1. Yes it is an E equation.

  2. It only faults if radians is chosen.

  3. c is not constant.

This returns the error somewhat like “xxx forbidden”