Finding the equation of a tangent plane to a surface.

**rorosingsong** · April 9th 2011, 03:10 AM

Hi all, I'm stuck on this differential calculus question and would really appreciate some help...

Find the equation of the tangent plane to he surface
z = cos(x+y) + 1 at (0,0,2)

Thanks,
rorosingsong

**Plato** · April 9th 2011, 04:23 AM

Originally Posted by rorosingsong

Find the equation of the tangent plane to he surface z = cos(x+y) + 1 at (0,0,2)

All you have done is state a problem. Please either post some of your own work on these problems or explain what you do not understand about the question.

If $F(x,y,z)=\cos(x+y)-z+1$ then what is $\nabla F~?$
What has that to do with this problem?

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