设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?

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设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?设f(x,y)=arcsin(y/x)^

设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?
设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?

设f(x,y)=arcsin(y/x)^1/2,则fx(x,y)|(2,1)=?
f(x,y)|(2,1)=arcsin(1/2)^(1/2)=arcsin(√2/2)
=π/4