Equation of Tangent to Curve 2e^(xy)-ysinx=log(y)+2 at (0,1)

  • Thread starter Thread starter E=m(C)^2
  • Start date Start date
  • Tags Tags
    Curve Tangent
AI Thread Summary
To find the equation of the tangent to the curve defined by 2e^(xy) - ysinx = log(y) + 2 at the point (0,1), implicit differentiation is recommended. The challenge lies in expressing the derivative y' correctly. By differentiating both sides with respect to x and y, the derivative can be isolated. Setting x=0 and y=1 allows for solving y' effectively. This approach clarifies the process of obtaining the tangent equation.
E=m(C)^2
Messages
14
Reaction score
0
Hi guys, I'm having a little trouble finding the equation of the tangent to the curve 2e^(xy) - ysinx = log(y) + 2 at the point (0,1).
I've basically concluded that either the equation
IMG00003.GIF
should be used or either find the gradient at (0,1) through differentiation and then use (y-y1)=m(x-x1).
But i can't seem to get the derivative in terms of y. Any help or advice would be much appreciated, thank you.
 
Physics news on Phys.org
I think the point was that you can't get the equation in terms of a solvable variable. You can, however, probably implicitly differentiate the above equation with respect to y and with respect to x. Have you tried that path yet?
 
The two equations you cite are in fact the same equation. The only difficulty is finding y'. As vsage says, use implicit differentiation.
If 2exy - ysinx = log(y) + 2 then
2exy(y+ xy')- y' cos x- y sin x= y'/y. Set x= 0, y= 1 and solve for y'.
 
Oh ofcourse, seems so simple now. Thanks a lot guys.
 
I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
Back
Top