a1, a2, a3, in R-{0} and a1+a2cos2x+a3...

`a_1, a_2, a_3, in R-{0}` and `a_1+a_2cos2x+a_3sin^2x=0fora l lx in R ,` then (a)vector ` vec a=a_1 hat i+a_2 hat j+a_3 hat ka n d vec b=4 hat i+2 hat j+ hat k` are perpendicular to each other (b)vector ` vec a=a_1 hat i+a_2 hat j+a_3 hat ka n d vec b=- hat i+ hat j+2 hat k` are parallel to each other (c)vector ` vec a=a_1 hat i+a_2 hat j+a_3 hat k` is of length`sqrt(6)` units, then one of the ordered triple `(a_1, a_2, a_3)=(1,-1,-2)` (d)are perpendicular to each other if `2a_1+3a_2+6a_3=26 ,t h e n|a_1 hat i+a_2 hat j+a_3 hat k|i s2sqrt(6)`

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