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Find the value of cos (–1710°).

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Find the value of cos (–1710°).

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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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