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TRIGONOMETRIC FUNCTIONS — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHSTRIGONOMETRIC FUNCTIONS1 Mark
Question
Find the value of cos (–1710°).
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Answer

Let y = cos (–1710°)
We know that values of cos x repeats after an interval of 2$\pi$ or 360°.
Therefore, we have
y = cos (–1710°) = cos (–1710° + 5 $\times$ 360°) = cos (–1710° + 1800°) = cos 90° = 0

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