Posted by June on September 28, 2002 at 19:07:20:
In Reply to: Re: really need help posted by Brad Paul on September 28, 2002 at 18:41:19:
I don't see how I can use what you wrote before...
without knowing what sin and cos are, they need numbers not letters in the answer.
: : the question is find sin 2, cos 2, tan 2.
: : tan x = -sqrt 2 and pi/2 < x < pi
: : How do you find cos and sin when you just know tan, I can't find any examples in the book. This is the full question. I know how to go on from there.
: : Their answer is
: : sin 2 x =-2((sqrt2)/3)
: : cos 2 x = -1/3
: : tan 2 x = 2(sqr(2))Ju
: tan(2 x)=2 tan(x)/(1-tan2(x))
: Along with what I wrote before.
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