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Let vecA be a vector parallel to the lin...

Let `vecA` be a vector parallel to the line of intersection of the planes `P_(1) and P_(2)`. The plane `P_(1)` is parallel to vectors `2hatj+3hatk and 4hatj-3hatk` while plane `P_(2)` is parallel to the vectors `hatj-hatk` and `hati+hatj`. The acute angle between `vecA` and `2hati+hatj-2hatk` is

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