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If 7sin^(2)theta+cos^(2)theta=4,0^(@)lt ...

If `7sin^(2)theta+cos^(2)theta=4,0^(@)lt theta lt90^(@)`, then the value of `(tan^(2)2theta+"cosec"^(2)2theta)` is :

A

a.`(1)/(sqrt(2))`

B

b.`(1)/(sqrt(3))`

C

c.`sqrt((3)/(2))`

D

d.1

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The correct Answer is:
B
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