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Evaluate each of the following cos^2 30° + cos^2 45° + cos^2 60° + cos^2 90°

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asked Feb 15, 2018 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 949
edited Mar 6, 2018 by faiz

Evaluate each of the following

cos2 30° + cos2 45° + cos2 60° + cos2 90°

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answered Feb 15, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 15

cos2 30° + cos2 45° + cos2 60° + cos2 90° …(i)
By trigonometric ratios we have

By substituting above values in (i), we get

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