The acute angle between the planes \( P_{1} \) and \( P_{2} \), when \( P_{1} \) and \( P_{2} \)...

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The acute angle between the planes \( P_{1} \) and \( P_{2} \), when \( P_{1} \) and \( P_{2} \) are the planes passing through the intersection of the planes \( 5 x+8 y+13 z-29=0 \) and \( 8 x-7 y+z-20=0 \) and the points \( (2,1,3) \) and \( (0,1,2) \) respectively, is
(a) \( \frac{\pi}{3} \)
(b) \( \frac{\pi}{4} \)
(c) \( \frac{\pi}{6} \)
(d) \( \frac{\pi}{12} \)
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