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How to do one-on-one, college physics, detailed steps, thank you! If it's convenient, you'd better write by hand and tick the questions.
The vibration equation of the reflected wave at point B is

y2B = A cos(ωt + 2π L / λ)

The vibration equation of incident wave at point B is

y 1B = A cos(ωt + 2π L / λ + π)

The wave equation of incident wave is

y 1 = A cos(ωt+2πL/λ+π+2π(L-x)/λ)

= A cos(ωt - 2π x / λ + π + 4π L / λ)