Question

4. If A = 30°; show that:
(i) sin 3 A
= 4 sin A sin (60° - A) sin (60° + A)​

Answer 1

Answer:

Put A=30° in both LHS & RHS

Step-by-step explanation:

LHS : sin 3×30°=sin 90°=1

RHS: 4 sin 30° . sin 30°.sin 90°

=4.(1/2).(1/2).1=1

LHS=RHS

Hence proved

Answer 2

@brainly..

Give A=30°

sinA=4sin(60–A).sin(60+A)

sin30°=4sin(60–30).sin(90)

1/2=4×1/2×1

1/2=2

NOOO!