Discussions

• Prove cos(x+y)*cos(x-y)=cos^2x - sin^2y?

  10 views 2 comments 0 points Most recent by jay May 2021Science & Mathematics
• Prove cos(x+y)*cos(x-y)=cos^2x - sin^2y?

  3 views 2 comments 0 points Most recent by jay May 2021Science & Mathematics