4 cos 90° + 2 cos 180

Question

4 cos 90° + 2 cos 180

Answer 1

1) 4 cos 90 = 0
2) 2 cos 180 = -1
3) 0 + (-1) = -1 
Ответ: -1

Comments

упс

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1) = 0

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2) = -2

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Ответ: -2