# SOLUTION: this is my problem that i cannot solve.. sin^4 - cos^4 = 2sin^2 - 1 we can only work on one side of the problem. this is what i have got so far (sin^2 + cos^2) (sin^2 - cos^2

Algebra ->  Algebra  -> Trigonometry-basics -> SOLUTION: this is my problem that i cannot solve.. sin^4 - cos^4 = 2sin^2 - 1 we can only work on one side of the problem. this is what i have got so far (sin^2 + cos^2) (sin^2 - cos^2      Log On

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 Click here to see ALL problems on Trigonometry-basics Question 282252: this is my problem that i cannot solve.. sin^4 - cos^4 = 2sin^2 - 1 we can only work on one side of the problem. this is what i have got so far (sin^2 + cos^2) (sin^2 - cos^2)= 1(sin^2 - cos^2)= sin^2 - cos^2 I'm not sure what to do from there to make it equal 2sin^2 - 1Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!sin^4 - cos^4 = 2sin^2 - 1 (Sin^2+cos^2)(sin^2-Cos^2) 1*(Sin^2-Cos^2) (1-cos^2)+sin^2 -1 Sin^2+sin^2-1 2Sin^2-1