Suppose that y1(x,t) and y2(x,t) are two independent wave functions, which describe the displacements  vertical (in meters) of a string, as a function of position x (in meters) and time t (in seconds):   (See image) For what values ​​of the phase constant ϕ1 does destructive interference occur?   Compliment: According to an article I've read on the internet, destructive interference occurs when ϕ1-ϕ2=180° What I did was : ϕ1+(π/3)=π Is it wrong?

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.