Posted by Brad Paul on September 28, 2002 at 18:41:19:
In Reply to: really need help posted by June on September 28, 2002 at 18:16:47:
: 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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