Cho hàm số \(y = \frac{{{x^2} + x + 1}}{{x - 1}}\). Vi phân của hàm số là:

A. \({\rm{d}}y = \left( { - \cos x + 3\sin x} \right){\rm{d}}x\).

B. \({\rm{d}}y = \left( { - \cos x - 3\sin x} \right){\rm{d}}x\).

C. \({\rm{d}}y = \left( {\cos x + 3\sin x} \right){\rm{d}}x\).

D. \({\rm{d}}y = - \left( {\cos x + 3\sin x} \right){\rm{d}}x\).

A. 9.

B. -9.

C. 90.

D. -90.

A.-0,07

B.10.

C.1,1

D. - 0,4

A. \(dy = \left( {\cos 2x + 3{{\sin }^2}x\cos x} \right)dx\)

B. \(dy = \left( {2\cos 2x + 3{{\sin }^2}x\cos x} \right)dx\)

C. \(dy = \left( {2\cos 2x + {{\sin }^2}x\cos x} \right)dx\)

D. \(dy = \left( {\cos 2x + {{\sin }^2}x\cos x} \right)dx\)

A. \(dy = \frac{1}{{\sqrt[3]{{{{(x + 1)}^2}}}}}dx\)

B. \(dy = \frac{3}{{\sqrt[3]{{{{(x + 1)}^2}}}}}dx\)

C. \(dy = \frac{2}{{\sqrt[3]{{{{(x + 1)}^2}}}}}dx\)

D. \(dy = \frac{1}{{3\sqrt[3]{{{{(x + 1)}^2}}}}}dx\)

A. \({\rm{d}}y = \left( {3{x^2} - 5} \right){\rm{d}}x\).

B. \({\rm{d}}y = - \left( {3{x^2} - 5} \right){\rm{d}}x\).

C. \({\rm{d}}y = \left( {3{x^2} + 5} \right){\rm{d}}x\).

D. \({\rm{d}}y = \left( {3{x^2} - 5} \right){\rm{d}}x\).

A. \({\rm{d}}y = \frac{1}{4}{\rm{d}}x\).

B. \({\rm{d}}y = \frac{1}{{{x^4}}}{\rm{d}}x\).

C. \({\rm{d}}y = - \frac{1}{{{x^4}}}{\rm{d}}x\).

D. \({\rm{d}}y = {x^4}{\rm{d}}x\).