Hi everyone, I have two questions I am struggling with. They are: work out the coordinates when the gradient of these functions is equal to zero

t=cos(theta)

and

Z=sin(2theta)

I think I need to find the derivatives, but then what?

Thanks in advance;

have a nice day.

t=cos(theta)

and

Z=sin(2theta)

I think I need to find the derivatives, but then what?

Thanks in advance;

have a nice day.

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