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Integration help

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
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Avatar for joostan
joostan
13
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.
Reply 2
Avatar for B_9710
B_9710
18
The curve is a cycloid :smile:

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