The displacement of a particle executing simple harmonic motion is given by $$y = A_0 + A \sin \omega t + B \cos \omega t$$
Then the amplitude of its oscillation is given by :
A
$$A_0 + \sqrt{A^2 + B^2}$$
C
$$\sqrt{A_0^2 + (A + B)^2}$$
Correct option is B. $$\sqrt{A^2 + B^2}$$
Given,
$$y = A_0 + A sin \omega t + B sin \omega t$$
Equation of SHM
$$y' = y - A_0 = A sin \omega t + B cos \omega t$$
Resultant amplitude,
$$R = \sqrt{A^2 + B^2 + 2 AB cos 90^{\circ}}$$
$$= \sqrt{A^2 + B^2}$$