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The value of theta lying between -(pi)/...

The value of `theta` lying between `-(pi)/(4) "and " (pi)/(2)` and `0leAle(pi)/(2)` and satisfying the equation
`|{:(1+sin^(2)A,cos^(2)A,2sin4theta),(sin^(2)A,1+cos^(2)A,2sin4theta),(sin^(2)A,cos^(2)A,1+2sin4theta):}|` =0 are

A

`A=(pi)/(4),theta=-(pi)/(8)`

B

`A=(3pi)/(8)=theta`

C

`A=(pi)/(5),theta=-(pi)/(8)`

D

`A=(pi)/(6),theta=-(3pi)/(8)`

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ARIHANT MATHS ENGLISH-DETERMINANTS -Exercise (Questions Asked In Previous 13 Years Exam)
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