Find all values of x such that – 5π ≤ x ≤ 5π and cos x = 1

Sum

cos x = – 1

cos x = cos π

x = (2n + 1)π

n = 0, ±1, ±2, – 3

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The Cosine Function and Inverse Cosine Function

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Chapter 4: Inverse Trigonometric Functions - Exercise 4.2 [Page 142]

Chapter 4 Inverse Trigonometric Functions
Exercise 4.2 | Q 1. (ii) | Page 142

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