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= Sin 240'Cos30' - Tan 45'
= Sin(180' + 60')Cos30' - Tan 45'
= -Sin60'Cos30' - Tan 45'
= (-1/2√3)(1/2√3) - 1
= -1/4(3) - 1
= -3/4 - 4/4
= - 7/4