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Mathematics
Scarlett Kelly
12 June, 07:12
Find the exact value of the expression cos (-105)
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Haleigh Mclean
12 June, 09:18
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Cos (-105) = cos105 = cos (90+15) = cos90cos15 - sin90sin15 = 0. cos15 - 1. sin5 = 0 - sin15 = - sin15
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