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Q.

The vectors 2 i-mj+3mk and (1+m) i2m j+k include an acute angle for

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a

m<–2 or m>–1/2 
 

b

m>2, m<1/2 
 

c

all values of m 
 

d

m > –2, m< –1/2 
 

answer is C.

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Detailed Solution

a.b>0  2+2m+2m2+3m>0               2m2+5m+2>0               (2m+1)(m+2)>0 

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m(-,-2)(-12,)

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