lenaliu3517 lenaliu3517

09-03-2018
Mathematics

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Use the angle sum identity to find the exact value of cos 105

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verdeesm3ralda verdeesm3ralda

09-03-2018

so use the angle sum identity which we know to be cos(105) =cos(45+60)=cos45 cos 60 - sin 45 sin 60

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