zayncookchung zayncookchung

07-03-2017
Mathematics

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Use a double or half angle identity to find cos (7π/12). Provide the exact answer in simplest form (no approximations)

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pdevereux pdevereux

07-03-2017

[tex] (\sqrt{6} + \sqrt{2})/4[/tex]. cos([tex]7 \pi /12[/tex]) is the same thing as cos(π/3 + π/4) and then you use the formula cos(a + b) = cos(a)cos(b) + sin(a)sin(b)

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