`y= a cos (kx + omega t)` superimposes on another wave giving a stationary wave having node at x = 0. What is the equation of the other wave

A wave represented by a given equation [y (x, t) = a sin (omega t - kx)] superimposes on another wave giving a stationary wave having antinode at x = 0 then the equation of the another wave is

A wave represented by the equation y = A cos (ks - omega t) superposes on another wave to produce a stationary wave with a node at s = 0 . What is the equation of this second wave ?

A wave representing by the equation y = a cos(kx - omegat) is superposed with another wave to form a stationary wave such that x = 0 is a node. The equation for the other wave is

A wave representing by the equation y = A cos(kx - omegat) is suerposed with another wave to form a stationary wave such that point x = 0 is a node. The equation for the other wave is

A wave represented by the equation y = a cos(kx - wt) is superposed with another wave to form a stationary wave such that point x= 0 is a node. The equation for the other wave is