if y= 3sin(2x+3) show that y"+4y=0

and

if y= sinx + 2cosx show that y", + y""+y, +y =O

can some1 explain to me how to do these and solve them

k thnx (Rofl)(Rofl)

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- Aug 5th 2012, 08:40 PMarsenal12345trig function differenciation
if y= 3sin(2x+3) show that y"+4y=0

and

if y= sinx + 2cosx show that y", + y""+y, +y =O

can some1 explain to me how to do these and solve them

k thnx (Rofl)(Rofl) - Aug 5th 2012, 09:27 PMsrirahulanRe: trig function differenciation
What is y'',Can you explain?

- Aug 5th 2012, 09:35 PMGJARe: trig function differenciation
Hi, srirahulan. To answer your question, y'' is the second derivative of the function we are considering - in this case y=3sin(2x+3).

- Aug 5th 2012, 09:50 PMGJARe: trig function differenciation
Hi, arsenal12345. What we need to do is compute the second derivative y'' of y=3sin(2x+3) first. Then add 4y to what we get and see if it does equal zero. Does this answer your question? Good luck!

- Aug 5th 2012, 10:10 PMarsenal12345Re: trig function differenciation
man i dont get it :( i am as lost as a nube can get

- Aug 5th 2012, 10:59 PMrichard1234Re: trig function differenciation
What GJA is saying, find $\displaystyle y''$ given that $\displaystyle y = 3 \sin (2x + 3)$. Does $\displaystyle y'' + 4y$ always equal zero?

- Aug 5th 2012, 11:15 PMarsenal12345Re: trig function differenciation
no

- Aug 5th 2012, 11:53 PMrichard1234Re: trig function differenciation
Are you sure?

- Aug 6th 2012, 12:04 AMarsenal12345Re: trig function differenciation
no not sure, can u please solve it and explain to me how u got ur answear ?

- Aug 6th 2012, 12:15 AMjgv115Re: trig function differenciation