evaluate cos(2 tan^-1(1/3))
I figure if I can evaluate arctan of 1/3 I can solve it (multiply by two and take the cosine of the result).
Is it advisable to do this with a calculator or is the value of acrtan(1/3) commonly known value?
thanks!
evaluate cos(2 tan^-1(1/3))
I figure if I can evaluate arctan of 1/3 I can solve it (multiply by two and take the cosine of the result).
Is it advisable to do this with a calculator or is the value of acrtan(1/3) commonly known value?
thanks!