Solve for f: gradf = (2xy + sin(x)i + (x2 + 2)j

  • Thread starter Thread starter -EquinoX-
  • Start date Start date
-EquinoX-
Messages
561
Reaction score
1
Last edited by a moderator:
Physics news on Phys.org
If \nabla f = (2xy + \sin x)\bold{i} + (x^2 + 2)\bold{j}, your answer is correct.
 
but then why webassign say it's wrong...
 
I checked again and It still looks right to me. Maybe you read the question wrong, or entered it wrong.
 
pretty sure it's not wrong... hmmm
 
okay.. I think the answer is right, it's just the way I format the answer in webassign and it doesn't accepts it.. also if I am asked:

Find the exact change in f between (0, 0) and (1, π/2).

do I just plug the numbers in?
 

Thread 'Prove that the integral is equal to ##\pi^2/8##'

Prove $$\int\limits_0^{\sqrt2/4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx = \frac{\pi^2}{8}.$$ Let $$I = \int\limits_0^{\sqrt 2 / 4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx. \tag{1}$$ The representation integral of ##\arcsin## is $$\arcsin u = \int\limits_{0}^{1} \frac{\mathrm dt}{\sqrt{1-t^2}}, \qquad 0 \leqslant u \leqslant 1.$$ Plugging identity above into ##(1)## with ##u...
View full post »

Similar threads

Solve the given differential equation
Replies
3
Views
567
Trigonometric Equations - Why Do I Always Get cos^3 or sin^3?
Replies
3
Views
2K
Homogeneous Diff. Eqn Finding Solution
Replies
5
Views
1K
Find f(x,y) given partial derivative and initial condition
Replies
6
Views
2K
Evaluate surface integral over surface
Replies
1
Views
6K
Differential of a y mixed with x
Replies
20
Views
2K
Optimization w/ Constraint Question (Multivariable Calculus)
Replies
7
Views
2K
Laplace transform of ##f(t)=(u(t)-u(t-2\pi))\sin{t}##
Replies
1
Views
848
Max. and Min. values - I don't understand
Replies
10
Views
3K
How can I optimize my homework solutions for efficiency and accuracy?
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top