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= Sin 240 + Sec 300 - Cot 330
= Sin (180 + 60) + Sec(360-60) - Cot(360-30)
= - Sin 60 + Sec 60 + Cot 30
= - 1/2 √3 + 2/3 √3 + √3
= - 3/6 √3 + 4/6 √3 + 6/6 √3
= 7/6 √3