Please help with this question

asked Sep 4, 2020 21.7k views

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3 votes

Answer:

Explanation:

The difference formula for cosine is

cos(x - y) = cosxcosy + sinxsiny

Consider

cos75 = cos(120 - 45)°, then

cos(120 - 45)°

= cos120°cos45° + sin120°sin45° → C

Heiko Rupp answered Sep 9, 2020

5.9k points

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