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The solution of x^(2)(dy)/(dx)-xy=1+cosy...

The solution of `x^(2)(dy)/(dx)-xy=1+cosy/x` is

A

`tan(y/(2x))=c-1/(2x^(2))`

B

`tany/x=c+1/x`

C

`cos(y/x)=1+c/x`

D

`x^(2)=(c+x^(2))tany/x`

Text Solution

Verified by Experts

The correct Answer is:
A

`x^(2)(dy)/(dx)-xy=1+cosy/x`
or `(x(xdy-ydx))/(dx) = 1+cosy/x`
or `((xdy-ydx)/x^(2))/(1+cosy/x)=(dx)/x^(3)`
or `int(d(y/x))/(1+cosy/x)=int(dx)/x^(3)`
or `1/2int(d(y/x))/(cos^(2)y/(2x))=int(dx)/x^(3)`
or `1/2int(d(y/x))/(1+cosy/2)=int(dx)/(x^(3))`
or `1/2intsec^(2)y/(2x).d(y/x)=int(dx)/x^(3)`
or `1/2(tany/(2x))/(1/2) = x^(-2)/-2+c`
or `tany/(2x)+1/(2x^(2))=c`
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