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Find the value of cos (–1710°).

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asked Dec 25, 2016 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 939

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answered Dec 25, 2016 by sforrest072 (157,439 points) ● 61 ● 410 ● 939
 
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We know that values of cos x repeats after an interval of 2π or 360°.
Therefore, cos (–1710°) = cos (–1710° + 5 x 360°)
= cos (–1710° + 1800°) = cos 90° = 0.

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