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CUET
General Test
Quantitative Reasoning
Trigonometry
If sin 3x = cos (3x - 45°) where 3x is an acute angle find the value of 2x.
30°
60°
35°
45°
We know that if sin A = cos B, then A + B = 90°
ATQ,
sin 3x = cos (3x - 45°)
⇒ 3x + 3x - 45° = 90°
⇒ 6x = 135°
⇒ 2x = 45°