Evaluate: limx → 0 (sin 4x/sin 2x)
Evaluate: limx → 0 (sin 4x/sin 2x)
= limx → 0 [(sin 4x/4x) × (2x/sin 2x) × 2]
= 2 × limx → 0 (sin 4x/4x) × limx → 0 (sin 2x/2x)
= 2 × lim4x → 0 (sin 4x/4x) × lim2x → 0 (sin 2x/2x)
= 2 × 1 × 1 = 2 (as x → 0, 4x → 0 and 2x → 0)