関連ワード:  is x square root a function    is x square root of a function    is square root x 3 a function    is square root x 1 a function    is sqrt x 2 a function    is y square root x 4 a function    is y square root x 2 a function    is square root of x 4 a function    is y square root x 5 a function    is y square root x 3 a function