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- Thread starter Calixto
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- #2

nicksauce

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[tex]D=\{x|x\in[\frac{(4n-1)\pi}{2},\frac{(4n+1)\pi}{2}]\}[/tex]

where n is any integer

- #3

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If x is +60 for example then cos(x)>0 but if it is -60, then it is <0. sqrt of that is an imaginary number which is not defined.

So basically for x>0 domain is (0,1)

I would like to know how Calixto got his answer as I may be wrong.

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