Question

If 0 = 30°, verify that
(1) sin 20 = 2 sin cos ook​

Answer 1

Q = 30°

Sin 2Q = 2sinQ cosQ

LHS = Sin (2×30 )

= Sin 60

= √3 / 2

RHS = 2SinQ CosQ

= 2 Sin (30) Cos (30 )

= 2 × (1/2) × ( √3 /2 )

= √3 / 2

LHS = RHS

hence proved