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प्रश्न
Solve for x : 2 cos (3x - 15°) = 1
उत्तर
2 cos(3x –15°) = 1
cos (3x – 15°) = `(1)/(2)`
cos (3x – 15°) = cos 60°
3x – 15° = 60°
3x = 75°
x = 25°
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