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Question
Solve for x : cos2 30° + cos2 x = 1
Sum
Solution
cos230° + cos2 x = 1
cos2 x = 1 – cos2 30°
cos2 x = 1 – `(3)/(4)`
cos x = `(1)/(2)`
x = 60°
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Trigonometric Equation Problem and Solution
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