If the angle between the planes `bar r .(m hati -hatj+2hatk)+3=0 and bar r.(2hati -m hatj - hatk )-5=0 ` is `(pi)/(3)` , then m=A. 2B. `+-3`C. `3`D. `-2`

If the angle between the planes `bar r .(m hati -hatj+2hatk)+3=0 and b

1.	If the angle between the planes `bar r .(m hati -hatj+2hatk)+3=0 and bar r.(2hati -m hatj - hatk )-5=0 ` is `(pi)/(3)` , then m=A. 2B. `+-3`C. `3`D. `-2`
Answer» Correct Answer - C

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