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Find the value of : cos 315° - Mathematics and Statistics

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Question

Find the value of :

cos 315°

Sum

Solution

cos 315° = cos (270° + 45°)

= sin 45°

= `1/sqrt(2)`

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Trigonometric Functions of Allied Angels
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Chapter 3: Trigonometry - 2 - Exercise 3.2 [Page 42]

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