1.

if `(2tan^(2)30^(@))/(1-tan^(2)30^(@))+sec^(2)45^(@)-sec^(2)theta^(@)=xsec60^(@)` then the value of x isA. 2B. 1C. 0D. `-1`

Answer» Correct Answer - b
`(2tan^(2)30^(@))/(1-tan^(2)30^(@))+sec^(2)45^(@)-45^(@)`
`- sec^(2)0^(@)=xsec60^(@)`
`rArr(2x((1)/sqrt(3))^(2))/(1-((1)/sqrt(3))^(2))+(sqrt(2))^(2)-1=x xx2`
`rArr(2xx(1)/(3))/(1-(1)/(2))+2-1=2x`
`rArr((2)/(3)xx(3)/(2))+2-1=2xrArr2=x xx2`


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