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attashe74 [19]
3 years ago
11

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

Mathematics
1 answer:
patriot [66]3 years ago
7 0
(\sqrt{6} +  \sqrt{2})/4. cos(7 \pi /12) is the same thing as cos(π/3 + <span>π/4) and then you use the formula cos(a + b) = cos(a)cos(b) + sin(a)sin(b)</span>
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