Kenia Kenia
  • 30-03-2014
  • Mathematics
Answered

verify 
cos^4x-sin^4x=cos2x



Answer :

crisforp
crisforp crisforp
  • 30-03-2014
a^2 - b^2 = (a - b)( a +b);
cos^4x-sin^4x =( cos^2x + sin^2x )( cos^2x - sin^2x) = 1* cos2x = co2x.
Answer Link

Other Questions

Pyrenees mountains border Spain and this European country starts with F
Water on each side of a divide flows in...
What is the difference between preterite and imperfect and the past progressive and present progressive?
What is 36 percent as a decimal?
How do you tell if an equation is linear or not????
How do you think the world was created?
What is a major city in Alaska that starts with F
What is the difference between preterite and imperfect and the past progressive and present progressive?
What is 36 percent as a decimal?
Pyrenees mountains border Spain and this European country starts with F