How to use the asin() function in objective c

Posted by Daniel Thatcher on Stack Overflow See other posts from Stack Overflow or by Daniel Thatcher
Published on 2010-12-30T18:46:14Z Indexed on 2010/12/30 18:54 UTC
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Filed under:

iphone

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objective-c

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ios

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trigonometry

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sin

I am trying to use the asin() function in an iOS app to calculate an angle from the y axis. I am using trigonometry, but I must be doing something wrong with the asin() function, as when I try to pass in 0.707.... as asin(rotation) where rotation is a double equivalent to 0.707..., I get around 0.78....., where as my calculator gives me 44.991..., which is about correct from the variables passed in. What am I doing wrong, please can somebody help me?

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