Recent content by RikB

  1. R

    Undergrad Proof Sin^2(x)-Sin^2(2x)=Cos^2(2x)-Cos^2(x) - Get Help Now!

    My past instructor said that in a formal proof always start from one side to get to the other and not to alter the other side. I'm sure if you can solve it by adding a one on the other side of the equation you can also solve it without.
  2. R

    Undergrad Proof Sin^2(x)-Sin^2(2x)=Cos^2(2x)-Cos^2(x) - Get Help Now!

    I have to do it in a formal math proof format so I can't add 1 on another side.
  3. R

    Undergrad Proof Sin^2(x)-Sin^2(2x)=Cos^2(2x)-Cos^2(x) - Get Help Now!

    sin^2(x)-sin^2(2x)=cos^2(2x)-cos^2(x) I need help with proving this trig identity. Every thing I've tried just makes the problem more confusing. How would you guys go about this?