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

Find the exact value of the expression cos (-105)
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1 vote
Find the exact value of the expression cos (-105)

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User Dung Phan
by
8.3k points

2 Answers

2 votes
cos(-©) negative angle is cos(+©) angle cos(-105) =cos(105) 105 =180-75 cos(180-75)= - cos(75) - cos(75)= - 0.26
answered
User Marimuthu Madasamy
by
8.0k points
1 vote
cos(-105) = cos105 = cos(90+15) = cos90cos15 - sin90sin15 = 0.cos15 - 1.sin5 = 0 - sin15 = -sin15
answered
User Martin Schaer
by
7.2k points
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