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  1. 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...
  2. 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...