SOLUTION: cos^4A-sin^4A=cos^2A-sin^2A

Question 1083877: cos^4A-sin^4A=cos^2A-sin^2A
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
That's a fact.

Answer by ikleyn(52898) (Show Source): You can put this solution on YOUR website!
.
= = = .

RELATED QUESTIONS
cos^4A+Sin^2A=Sin^4A+Cos^2A (answered by ikleyn)
Prove that {{{ Cos^4A - Sin^4A = 1 - 2Sin^2A... (answered by lwsshak3)
If sin(A)=-5/13. Find: 1. cos(2A) 2. sin(2A) 2.... (answered by Alan3354)
A is a reflexive angle whose sin is -5/13. Find: 1. sin (2A) 2. cos (2A) 3. sin (4A (answered by Alan3354)
Solve:... (answered by Alan3354)
simplify... (answered by Alan3354)
Cos 2A + 1/Cot A = Sin... (answered by Alan3354)
Sin^2a cos^2b - cos^2a sin^2b = sin^2a - sin^2b (answered by rapture1965)
Help, please!!! I am supposed to circle all expressions that are equivalent to sin 4a.... (answered by ikleyn)