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Find the amplitude and sketch the wave

2. A wave has the form y = А сos(2лx/λ+л/3) when
x<0. For x > 0, the wavelength is 1/2. By applying con-
tinuity conditions at x = 0, find the amplitude (in terms
of A) and phase of the wave in the region x > 0. Sketch
the wave, showing both x < 0 and x > 0.

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