How to solve this?
cos 2pi/7 +cos 4pi/7 +cos 6pi/7 =?
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(cos(2))(3.141593)7+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=(−0.416147)(3.141593)7+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−1.3073647+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−0.186766+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−0.186766+(−0.653644)(3.141593)7+(cos(6))(3.141593)7
=−0.186766+−2.0534827+(cos(6))(3.141593)7
=−0.186766+−0.293355+(cos(6))(3.141593)7
=−0.480121+(cos(6))(3.141593)7
=−0.480121+(0.96017)(3.141593)7
=−0.480121+3.0164647
=−0.480121+0.430923
=−0.04919 ans
thanks
=(−0.416147)(3.141593)7+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−1.3073647+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−0.186766+(cos(4))(3.141593)7+(cos(6))(3.141593)7
=−0.186766+(−0.653644)(3.141593)7+(cos(6))(3.141593)7
=−0.186766+−2.0534827+(cos(6))(3.141593)7
=−0.186766+−0.293355+(cos(6))(3.141593)7
=−0.480121+(cos(6))(3.141593)7
=−0.480121+(0.96017)(3.141593)7
=−0.480121+3.0164647
=−0.480121+0.430923
=−0.04919 ans
thanks
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