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Find the value of cot^2 30^@-2cos^2 60^@...

Find the value of `cot^2 30^@-2cos^2 60^@- 3/4 sec^2 45^@-4sin^2 30^@`.

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  10. Find the value of cot^2 30^@-2cos^2 60^@- 3/4 sec^2 45^@-4sin^2 30^@.

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