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  3. f(x,y)=sin(2x)sin(y) intervals for x and y: -?/2 ?

f(x,y)=sin(2x)sin(y) intervals for x and y: -?/2 ? x ? ?/2 and -? ? y ? ? find...

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Basic Math

f(x,y)=sin(2x)sin(y)

intervals for x and y:

-?/2 ? x ? ?/2 and -? ? y ? ?

find extrema and saddle points

In the solution, I mainly interested how tofindcritical points in case of the system of trigonometricequations (fx=0 and fy=0).
,

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