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Calculate : `cot^(2)30^(@)-2cos^(2)60^(@)-(3)/(4)sec^(2)45^(@)-4sin^(2)30^(@)`.

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`cot^(2)30^(@)-2 cos^(2)60^(@)-(3)/(4) sec^(2)45^(@)-4 sin^(2)30^(@)`
`=(sqrt(3))^(2)-2xx((1)/(2))^(2)-(3)/(4) xx (sqrt(2))^(2)-4xx((1)/(2))^(2)`
`=3-2xx(1)/(4)-(3)/(4)xx2-4xx(1)/(4)`
`=3-(1)/(2)-(3)/(2)-1=(6-1-3-2)/(2)=(6-6)/(2)=(0)/(2)=0`.

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