Asked by Sinachi
Find cosπ/12 and 7π/12 using the known values of sine cosine and tan of π/3 and π/4
Answers
Answered by
oobleck
since π/12 = π/3 - π/4, just use the sum/difference formulas:
cos π/12 = cos π/3 cos π/4 + sin π/3 sin π/4
cos 7π/12 = cos π/3 cos π/4 - sin π/3 sin π/4
cos π/12 = cos π/3 cos π/4 + sin π/3 sin π/4
cos 7π/12 = cos π/3 cos π/4 - sin π/3 sin π/4
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