Custom fitting power1 equation of the type Y=A*(sind(x))^N

I have power equation of the type this resembles to the power1 fit in a custom fitting equation which is of the type

here my X is sind(X) function. Any help.

myfittype = fittype('(k*sind(x)).^N',... % .^N

'dependent',{'y'},'independent',{'x'},...

'coefficients',{'k','N'}, 'Lower', [0]);

[myfit1, goodness1, output1] = fit(x,y,myfittype);

plot(myfit1,x,y);

This did not work.

ANy help

[Rik]

This is still a continuation of your previous question. Please respond there.

Also, this question is missing the essential requirement that N should be a non-zero positive integer.