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Question
Find the value of :
cos 1140°
Sum
Solution
We know that cosine function is periodic with period 2π.
∴ cos 1140° = cos (3 x 360° + 60°)
= cos 60°
= `1/2`.
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Periodicity of Trigonometric Functions
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Chapter 2: Trigonometry - 1 - EXERCISE 2.2 [Page 31]
