Re: really need help

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

Use:

tan(2 x)=2 tan(x)/(1-tan²(x))

Along with what I wrote before.

Follow Ups:

• could someone help me Brad Paul's answer doesn't work June 19:37:25 09/28/02 (2)
  • perhaps if you would type the problem correctly, you would get a response that makes sense -nt- T.Gracken 20:11:51 09/28/02 (1)
    • Figured it out June 00:01:20 09/29/02 (0)
• numbers are needed in the answer not letters June 19:07:20 09/28/02 (0)

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