SOLUTION: Prove: cos^2 z+1=2cos^2 z+sin^2

Algebra ->  Trigonometry-basics -> SOLUTION: Prove: cos^2 z+1=2cos^2 z+sin^2      Log On


   

Question 446689: Prove: cos^2 z+1=2cos^2 z+sin^2
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Prove: cos^2 + 1=2cos^2 + sin^2
----------------
Subtract cos^2
1 = cos^2 + sin^2
QED