A.\(2.\)
B.\(4.\)  
C.\(3.\)  
D.\(1.\)

A.\(\dfrac{{x - 1}}{1} = \dfrac{y}{1} = \dfrac{{z - 1}}{{ - 1}}\)
B.\(\dfrac{{x + 1}}{{ - 1}} = \dfrac{{y + 1}}{{ - 1}} = \dfrac{{z - 2}}{1}\)
C.\(\dfrac{{x - 1}}{1} = \dfrac{{y - 2}}{1} = \dfrac{{z - 3}}{{ - 1}}\) \(\)
D.\(\dfrac{{x - 1}}{1} = \dfrac{y}{{ - 1}} = \dfrac{{z - 1}}{1}\)

A.\(1 + \pi \)
B.\( - 1 + \pi \)  
C.\(1 + \dfrac{\pi }{2}\)  
D.\( - 1 + \dfrac{\pi }{2}\)

A.\(4 + \sqrt 3 \)
B.\(2 + \sqrt 3 \)  
C.\(4 - \sqrt 3 \)  
D.3

A.
B.
C.
D.

A.\(\dfrac{{3\sin x - \sin 3x}}{{12}} + C\)
B.\(\dfrac{{3\cos x - \cos 3x}}{{12}} + C\)
C.\({\sin ^3}x + C\)
D.\(\sin x{\cos ^2}x + C\)

A.\(\int {{{\cos }^2}2xdx}  = \dfrac{x}{2} + \dfrac{1}{8}\sin 4x + C\)
B.\(\int {{{\sin }^2}2xdx}  = \dfrac{x}{2} - \dfrac{1}{8}\sin 4x + C\)
C.\(\int {\cos 4xdx}  = \dfrac{1}{4}\sin 4x + C\)
D.\(\int {{{\cos }^2}2xdx}  =  - {\cos ^2}2x + C\)

A.\(\int {\cos 3x\cos xdx}  = \dfrac{1}{2}\left( {\dfrac{1}{4}\sin 4x + \dfrac{1}{2}\sin 2x} \right) + C\)
B.\(\int {\sin 3x\cos xdx}  = \dfrac{{ - 1}}{2}\left( {\dfrac{1}{4}\cos 4x + \dfrac{1}{2}\sin 2x} \right) + C\)
C.\(\int {\sin 3x\cos xdx}  = \dfrac{{ - 1}}{2}\left( {\dfrac{1}{4}\cos 4x + \dfrac{1}{2}\cos 2x} \right) + C\)
D.\(\int {\sin x\cos xdx}  = \dfrac{{ - \cos 2x}}{4} + C\)

A.\(\dfrac{1}{3}{\sin ^3}x - \dfrac{1}{5}{\sin ^5}x + C\)
B.\( - \dfrac{1}{3}{\sin ^3}x + \dfrac{1}{5}{\sin ^5}x + C\)
C.\({\sin ^3}x - {\sin ^5}x + C\)
D.Đáp án khác

A.\(\cos x + {\sin ^2}x - \dfrac{{{{\sin }^3}x}}{3} - \dfrac{{{{\cos }^4}x}}{4} + C\)
B.\(\sin x + \dfrac{{{{\sin }^2}x}}{2} - \dfrac{{{{\sin }^3}x}}{3} - \dfrac{{{{\cos }^4}x}}{4} + C\)
C.\( - \dfrac{{{{\sin }^4}x}}{4} - \dfrac{{{{\sin }^3}x}}{3} + \dfrac{{{{\cos }^2}x}}{2} + \sin x + C\)
D.\( - \dfrac{{{{\sin }^4}x}}{4} - \dfrac{{{{\sin }^3}x}}{3} + \dfrac{{{{\cos }^2}x}}{2} - \sin x + C\)