$2$ particles $p$ and $q$ describe $SHM$ of same amplitude $a$ and same frequency $f$ along straight line, the maximum distance between the two particle $a\sqrt 2 $ . The initial phase difference between particle is
Diffcult
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$\sin \alpha=\frac{a / \sqrt{2}}{a}$
$\alpha=45^{\circ}$
$\phi=2 \alpha=90^{\circ}$
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