How to show the black body radiation in terms of frequency, chemistry homework help

We know, in terms of wavelength that the black body radiation density is:

How would you show that this is also the black body radiation density but in terms of frequency, using c = wavelength*frequency


I have tried simply substituting the equation for speed of light in for c to simplify in the first equation but i do not know where to go form there. Thank you

 
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