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what is the formula of stationary waves ?...Could u please tell me

In physics stationary waves also known as standing waves is the waves that remains in a constant position.

The formula for it is:
y= 2y' cos(ωt) sin(kx)
where
y' is the amplitude of the wave,
ω (called angular frequency, measured in radians per second) is 2π times the frequency (in hertz),
k (called the wave number and measured in radians per metre) is 2π divided by the wavelength λ (in metres), and
x and t are variables for longitudinal position and time, respectively.
Hope it helped

Formula for stationary/standing waves:-

y(x,t) = 2yocos(wt)sin(Kx)
It is the function which is dependent on both time and position. It is not the period.

Here, I am attaching a file for the brief explanation of stationary/standing waves. Hope it will help you a lot.