candy30ha candy30ha
  • 17-08-2016
  • Mathematics
contestada

find the exact value of the expression cos (-105)

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princegn
princegn princegn
  • 17-08-2016
cos(-105) = cos105 = cos(90+15) = cos90cos15 - sin90sin15 = 0.cos15 - 1.sin5 = 0 - sin15 = -sin15
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Slindelo
Slindelo Slindelo
  • 17-08-2016
cos(-©) negative angle is cos(+©) angle cos(-105) =cos(105) 105 =180-75 cos(180-75)= - cos(75) - cos(75)= - 0.26
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