April 20, 2014

Homework Help: Trigonometry

Posted by Jen on Friday, July 27, 2007 at 12:16am.

I need help with I just can't seem to get anywhere. this is as far as I have got:

Solve for b
arcsin(b)+ 2arctan(b)=pi


Sub in Sin difference identity
let 2U=(2arctan(b))



Now what should I do?

2 sin(arctan(b))cos(arctanb)

If you draw a right triangle with the lenghts of the two sides at right angles b and 1, so that one of the angeles becomes arctan(b), you see that

sin(arctan(b)) = b/sqrt[1+b^2]

cos(arctan(b)) = 1/sqrt[1+b^2]

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