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- Homework Statement
- we know α ∈ [0, π] and cos α = √5/3, what is the exact value of sin α and the approx. angle of sin α?

- Relevant Equations
- sin[sup]2[/sup] α + cos[sup]2[/sup] α = 1, unit circle

First off sorry if something doesn't make sense, english is not my native language.

I know i should start with sin

i am being confused by cos α = √5/3 since i know it isn't found in normal trig tables. So my problem is how to find out values of any radian value, and how to find out the corresponding value in sin?

I know i should start with sin

^{2}α + cos^{2}= 1, but ant really continue from it.i am being confused by cos α = √5/3 since i know it isn't found in normal trig tables. So my problem is how to find out values of any radian value, and how to find out the corresponding value in sin?