evaluate cot square 30 - 2 cos square 60 - 3/4 sec square 45 - 4 sec square 30
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cot^2 30-2 Cos^2 60-3/4Sec^2 45 -4 sec^30
=(√3)^2 -2(1/2) ^2 -3/4(√2) ^2-4(2/√3) ^2
=3 -1/2 -3/2- 8/3
=-5/3
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