` 2 sin^(2) 30^(@) tan60^(@) -3 cos^(2)60^(@) sec^(2) 30^(@)` का मान ज्ञात करो ।

Explanation

` 2 sin^(2) 30^(@) tan60^(@) -3 cos^(2)60^(@) sec^2 30^(@)`
` = 2 ( sin30^(@))^(2) tan 60^(@) -3(cos 60^(@))^(2) (sec30^(@))^2 `
`=2 xx ((1)/(2))^(2)xx sqrt(3)-3 xx ((1)/(2))^(2)xx((2)/(sqrt(3)))^(2)`
` 2 xx (1)/(4) xx sqrt(3)-3 xx (1)/( 4 ) xx (4)/(3)=(sqrt(3))/(2)-1=(sqrt(3)-2)/(2)`