Question #11800167

Help with finding direction angle of vector help please?

I am asked to find the direction angle of vector u = <3,-4> So I already have tan(x) = -4/3 How do I solve this??? How do I input this in a calc? I know if it's tan(x) = 5/-1 Then it's tan^-1(-5)

2013-11-14 21:43:44

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