If sin x = cos x and x is acute, state the value of x.
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Prove that :
sin 60° = 2 sin 30° cos 30°.
4 (sin4 30° + cos4 60°) - 3 (cos2 45° - sin2 90°) = 2
If sec A = cosec A and 0° ≤ A ≤ 90°, state the value of A.
If tan θ = cot θ and 0° ≤ θ ≤ 90°, state the value of θ.