Solve for x : 2 cos (3x − 15°) = 1

बेरीज

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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