Asked by Kiely
                cos^4 x - sin^4 x = 1 - 2sin^2 x
Prove
            
        Prove
Answers
                    Answered by
            Michael
            
    Work with only one side to get it to match the other. It's critical you alter only ONE  side.
What progress have you made, and where are you having problems?
    
What progress have you made, and where are you having problems?
                    Answered by
            Kiely
            
    I am completely stumped. I've never worked with ^4 before and I don't know how to factor it out.
    
                    Answered by
            Michael
            
    Break cos^4(x) into cos^2(x)*cos^2(x).
    
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