The angle between two vectors a→=3i^+4j^+5k^ and b→=3i^+3j^+pk^ is π4rad. Find the value of 70p.

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answer is 3.

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Detailed Solution

a→⋅b→=|a→||b→|cos⁡θ Or 9+12+5p=509+9+p2×12∴p=370

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