Solve the following equation for A, if 2cos2A = 1 - Mathematics

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Sum

Solve the following equation for A, if 2cos2A = 1

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Solution

2 cos 2 A = 1 
cos 2 A = `(1)/(2)`
cos 2 A = cos 60°
2A = 60°
A = 30°

Concept: Trigonometric Equation Problem and Solution
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APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 23 Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios]
Exercise 23 (C) | Q 1.2 | Page 297
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