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C4 Trig Help

Quick question:

How does one get from 1/(cos^2x)^3/2 . cosx dx to 1/(cos^2x)?

This is from June 05 and is question 4, I can see from the MS that it goes to this but dont understand how. Any help would be much appreciated.
Reply 1
Original post by Sach2K10
Quick question:

How does one get from 1/(cos^2x)^3/2 . cosx dx to 1/(cos^2x)?

This is from June 05 and is question 4, I can see from the MS that it goes to this but dont understand how. Any help would be much appreciated.


Is this what you mean?



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Reply 2
yes
Reply 3
so cos is squared then square rooted then cubed

All in the denominator

And then there is a cos in the numerator that can cancel
Reply 4
Ahh that makes sense thank you

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