Second Derivative of Trigonometry function

Dear All,

I'm a newbie here and wish to seek assistance from expert here.

I have one question in the past year exam question. the question is

(4y^3)*(d^2y/dx^2)+(y^4)+1=0

where y=(cos x)^1/2

i really seek assistance from experts here..

thank you,

Re: Second Derivative of Trigonometry function

Quote:

Originally Posted by

**wa1515** Dear All,

I'm a newbie here and wish to seek assistance from expert here.

I have one question in the past year exam question. the question is

(4y^3)*(d^2y/dx^2)+(y^4)+1=0

where y=(cos x)^1/2

i really seek assistance from experts here..

thank you,

Re: Second Derivative of Trigonometry function

Quote:

Originally Posted by

**wa1515** Dear All,

I'm a newbie here and wish to seek assistance from expert here.

I have one question in the past year exam question. the question is

(4y^3)*(d^2y/dx^2)+(y^4)+1=0

where y=(cos x)^1/2

i really seek assistance from experts here..

thank you,

It would help if you posted the actual question. Are we to assume that the actual question asks you to verify y=(cos x)^1/2 as a solution to the DE and your problem is in calculating d^2y/dx^2?