how to calculate cos , sin , tan in IPhone SDK?

How do you calculate trig functions like cos, sin, tan in the iPh开发者_开发问答one SDK?

i tried tan(45) but it returns wrong output? any help?

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Most math libraries use radians, not degrees.

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functions like cos, sin and tan are in the standard library and can be used by including math.h. You can get a good overview of these by typing 'man math' in a Terminal window on your Mac. More specific info can be read by typing 'man sin' for example. You will then see that sin() takes a radians arguments, not degrees. Search here on Stack Overflow if you don't know how to convert radians to degrees.

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If you get the output in Radians you can convert it to degrees.

Radian * (180/pi)

pi = 3.1415926535897932384626433.......