Find the tangent plane to the equation
z
=
3
y
cos
(
6
x
−
5
y
)
\displaystyle {z}={3}{y}{\cos{{\left({6}{x}-{5}{y}\right)}}}
z
=
3
y
cos
(
6
x
−
5
y
)
at the point (5,6,18)
z
\displaystyle {z}
z
=
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