The domain of the function `f(x) = sqrt(10 - sqrt(x^4 - 21x^2))`

The domain of the function f(x)= sqrt(cos x) is

The domain of the function f(x)=sqrt(cos x) is

The domain of the function f(x)=sqrt(10-sqrt(x^4-21 x^2)) is a. [5,oo) b. [-sqrt(21),sqrt(21)] c. [-5,-sqrt(21)]uu[sqrt(21),5]uu{0] d. (-oo,-5] U [5,oo)

The domain of the function f(x)=sqrt(10-sqrt(x^4-21 x^2)) is a) [5,oo) b. [-sqrt(21),sqrt(21)] c. [-5,-sqrt(21)]uu[sqrt(21),5]uu{0] d. (-oo,-5)

The domain of the function f(x)=sqrt(10-sqrt(x^4-21 x^2)) is a. [5,oo) b. [-sqrt(21),sqrt(21)] c. [-5,-sqrt(21)]uu[sqrt(21),5]uu{0] d. (-oo,-5] U [5,oo)

The domain of the function f(x)=sqrt(10-sqrt(x^4-21 x^2)) is [5,oo) b. [-sqrt(21),sqrt(21)] c. [-5,-sqrt(21)]uu[sqrt(21),5]uu{0] d. (-oo,-5)

The domain of the function f(x)=sqrt(x-sqrt(1-x^2)) is

The domain of the function f(x)=sqrt(|x|) is :