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= - sin 960
= - sin(2.360 + 240)
= - sin 240
= - sin (180 + 60)
= sin 60
= 1/2√3
cosec 450 - 2 sin 270
= cosec(1.360 + 90) - 2 sin 270
= cosec 90 - 2 sin 270
= 1 - 2.(-1)
= 3