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Vlada [557]
3 years ago
6

E = cos20º + cos40º + cos60º + … cos160º + cos180º

Mathematics
1 answer:
r-ruslan [8.4K]3 years ago
8 0

Answer:

C) – 1

Step-by-step explanation:

E = cos20º + cos40º + cos60º +cos80° + cos 100°+cos120° +cos140° +cos160º + cos180º

E= 0.9 + 0.76 + 0.5+0.17+(-0.17)+(-0.5)+(-0.76) + ( – 0.9 ) + (– 1 )

E= 0.9 + 0.76 + 0.5 +0.17 - 0.17 - 0.5 -0.76 – 0.9 – 1

E= – 1

So ; equal – 1

I hope I helped you^_^

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