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Let theta be the angle between the plane...

Let `theta` be the angle between the planes `P_(1):vec r . (hat i+hat j+2hat k)=9` and `P_(2): vec r . (2hat i-hat j+hat k)=15`.Let `L` be the line that meets `P_(2)` at the point `(4,-2,5)` and makes an angle `theta` with the normal of `P_(2)`.If `alpha` is the angle between `L` and `P_(2)`,then `(tan^(2)theta)(cot^(2)alpha)` is equal to

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