Equation of tan plane

calchere

Junior Member
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Sep 13, 2006
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Find equations of (a) the tangent plane and (b) the normal line to the given surface at the specified point.

x - z = 4arctan(yz) , (1 + pi, 1, 1)

My work-

x - z - 4arctan(yz)
<d/dx, d/dy, d/dz> = <1, -(4z)/(y^2z^2+1), -(4y)/(y^2z^2+1) - 1 )

a)
F(1+pi, 1, 1)= <1, -2, -3> is the normal vector
so the equation would be- 1(x-(1+pi))-2(y-1)-3(z-1)

b)
parametric equations- x= (1+pi)+t , y= 1-2t, z= 1-3t
symetric equations- (x-(1+pi))/1 , (y-1)/(-2), (z-1)/(-3)

is this correct? I wasn't sure if i should do:
x-z-4arctan(yz)
or
(x-z)/(arctan(yz))=4
 
It looks as if your work is correct from my quick reading.
But in part (a) it should =0. A plane is an equation.
Part (b) is in correct form.
 
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