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A value of theta in (0, pi//3), for whic...

A value of `theta in (0, pi//3),` for which
`|{:(1+"cos"^(2)theta, "sin"^(2)theta, 4"cos" 6 theta), ("cos"^(2)theta, 1+"sin"^(2)theta, 4"cos"6theta), ("cos"^(2)theta, "sin"^(2)theta, 1+4"cos"6theta):}| = 0,` is

A

`(7pi)/(36)`

B

`(pi)/(18)`

C

`(7pi)/(24)`

D

`(pi)/(9)`

Text Solution

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The correct Answer is:
D
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