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BaLLatris [955]
4 years ago
13

Cos(2x)cos(x)+sin(2x)sin(x)=1

Mathematics
1 answer:
Finger [1]4 years ago
5 0

Answer:

=cos(x) use basic properties of sosine (addition and subtraction) cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

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