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lisov135 [29]
3 years ago
14

Prove that: Cos2pi/7+cos4pi/7+cos8pi/7=-1/2

Mathematics
1 answer:
Anna007 [38]3 years ago
8 0

Answer:

1. use a calculator to help

2. that's wrong because it equals 1.333...

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Draw the standard normal distribution curve
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Step by step Instructions
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(4^-1/2^-2)^2
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