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# C4 Trig Help watch

1. 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.
2. (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?

3. yes
4. 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
5. Ahh that makes sense thank you

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