Two particles oscillating in $SHM$ along two very close parallel path such that they have same mean position. The equation of $SHM$ of two particles are $x_1 = A\, sin\,\omega t$ and $x_2 = A\,sin(\omega t + \phi )$ respectively. If maximum distance between them is $\frac{6A}{5}$ then $\phi $ equal to ..... $^o$
A$60$
B$37$
C$74$
D$90$
Diffcult
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C$74$
c $\sin \frac{\phi}{2}=\frac{3}{5}$
$\phi=74^{\circ}$
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