Please help solving this. If y= sin^3(4pix), show what d^2y/dx^2 - 3pi^2y will equal. If you were given what the expression equal, could you prove the equality? To see the equations (as i couldn't type them properly), look at the picture at question 6. Thanks.
Last edited by onehundredpercenteffort; Apr 7th 2013 at 04:07 PM.
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You have to find the 2nd derivative of y with respect to x, then substract sin^3(4pix) multiplied by 3*pi^2 from what you got. Where are you having difficulties?
i got the first derivative, but has trouble with the 2nd derivative. I have a test on this tmrw.
Can you show us what you got for your first derivative and what you have tried to get your second derivative?
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