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Solve for x : cos2 30° + cos2 x = 1

Solve for x : cos² 30° + cos² x = 1

Sum

cos²30° + cos²x = 1
cos²x = 1 – cos²30°

cos²x = 1 – `(3)/(4)`

cos x = `(1)/(2)`

x = 60°

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Trigonometric Equation Problem and Solution

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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - TEST YOURSELF [Page 335]

Chapter 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
TEST YOURSELF | Q 7. (x) | Page 335

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