posie43 posie43

18-08-2019
Mathematics

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Please help with this question

Please help with this question class=

Respuesta :

jimrgrant1 jimrgrant1

18-08-2019

Answer:

C

Step-by-step 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

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