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Maths Trigonometrical Ratios, Functions and Identities Mix Subjective Type

Published on: August 12, 2026

Solve sin 2 θ – cos θ = 1/4, where θ ∈ [0, 2 π ].

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The correct answer is:

CHECK THE SOLUTION.

1– cos 2 θ –cos θ = ⇒ 4 cos 2 θ + 4cos θ – 3=0

⇒ (2cos θ – 1)(2cos θ + 3) = 0

⇒ cos θ =

⇒ θ = ,

and cos θ = (not true) as –1 ≤ cos θ ≤ 1

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