Question: Please help me solve the question 6 and 7 6. The vectors a5b and ab are perpendicular. If a and b are unit vectors, then

Please help me solve the question 6 and 7 6. The

Please help me solve the question 6 and 7

6. The vectors a5b and ab are perpendicular. If a and b are unit vectors, then determine ab.[A5] 7. If A,B and C represent the direction angles for vector OP, Prove that sin2A+sin2B+sin2C=2. [T5]

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