teriateria
26.09.2019 •
Mathematics
Find the exact value of cos 75 by using a sum or difference formula
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Ответ:
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
Ответ: