Two travelling waves of equal amplitudes and equal frequencies move in opposite directions along a string. They interfere to produce a stationary wave whose equation is given by $y=\left(10 \cos \pi x \sin \frac{2 \pi t}{T}\right)\, cm$
The amplitude of the particle at $x =\frac{4}{3} \,cm$ will be........ $cm$.
JEE MAIN 2022, Medium
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$10 \cos \left(\frac{4 \pi}{3}\right)$
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