3/4( cot²60-cosec²60)-1/2sec²30
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Step-by-step explanation:
3/4(cot^2 60- cosec^2 60) - 1/2 sec^2 30
=3/4(-1) -1/2(2/√3)^2
=(-3/4)-(1/2)(4/3)
=-3/4 -4/6
=-3/4 -2/3
=(-9-8)/12
=-17/12
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