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= - cot (300) + sec 210
= - cot (360 -30) + sec (180+30)
= - (- cot 30) + (- sec 30)
= cot 30 - sec 30
= 1/tan 30 - 1/cos 30
= 1/3 √3 - 2/3 √3
= (1/3 - 2/3) √3
= - 1/3 √3