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  1. J

    Find point of intersection of a line and a plane

    Yea your right that's what i meant -2(Eq 1) + Eq 2. I was doing it right all along? Cool. I understand what I have to do next it seems much more less confusing than before. Thanks a lot now I can finally finish this question off. :D Just finished I got the point of intersection between the...
  2. J

    Find point of intersection of a line and a plane

    Homework Statement Find the point of intersection of the line and the plane. Line: x=4+k y=2-2k z=6+3k Plane: x=-1-s+2t y=1-s+4t z=2+3s+t Homework Equations None. The Attempt at a Solution So I'm not that well informed with how...
  3. J

    Confused about double angle identities

    yea then i get: cos2xcosx + sin2xsinx + cos2x + cosx
  4. J

    Confused about double angle identities

    lol, sorry for not stating this, but i have to prove not solve.
  5. J

    Confused about double angle identities

    dosen't matter i was able to solve it, but here's another problem which I'm now stuck with. cosx+cos2x+cos3x=cos2x(1+2cosx). I've tried many things with this problem, but always seem to get lost. The only given identites which I'm given to use: cos2x=cos^2x-sin^2x cos2x=2cos^2x-1...
  6. J

    Confused about double angle identities

    Homework Statement sin4x-sin2x/sin2x=cos3x/cosx Homework Equations sin2x = 2sinxcosx The Attempt at a Solution LS = sin(2x + 2x) - sin2x/sin2x = sin2xcos2x + cos2xsin2x - sin2x/sin2x = 2sin2xcos2x - sin2x/sin2x This is where i get stuck... I don't know what happens if you try...
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