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KengaRu [80]
3 years ago
6

Find the exact value of cos 75 by using a sum or difference formula

Mathematics
1 answer:
anygoal [31]3 years ago
3 0
Cos 75 = 45 + 30

Formula: cos 45 x cos 30 - sin 45 x sin 30

Cos 45 = root 2 / 2
Cos 30 = root 3 / 2
Sin 45 = root 2 / 2
Sin 30 = 1 / 2

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<em>Additional comment</em>

These rules apply to even/odd:

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