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# Integration help

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1. Can someone explain how you go from a(2-2cost)^1/2. To the last line is it using half angles? Also how come the limits change? Thanks
http://m.imgur.com/LB6ZEJa,b5DDHMO
2. (Original post by Super199)
Can someone explain how you go from a(2-2cost)^1/2. To the last line is it using half angles? Also how come the limits change? Thanks
http://m.imgur.com/LB6ZEJa,b5DDHMO
Yes, it's half angles.
The limits changing I guess is a typo.
3. The curve is a cycloid

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