Graphical representation of standing waves due to reflection from FIXED end STD 11 Waves Physics

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[@RoshanKumar-ft8nb]

Great explanation Sir, I have a small doubt: for 2) at t=T/4, yi=+Acos kx and yr=-Acoskx, so when plotted yi should be at +ive y-axis (+A) and yr at -ive y-axis (-A)?