4. If A = 30°, show that :
(i) sin 3 A
= 4 sin A sin (60° - A) sin (60° + A)
Answers
Answered by
0
Answer:- LHS=sin3A=sin3(30
o
)=sin90
o
=1
RHS=4sinAsin(60
o
−A)sin(60
o
+A)=4sin30
o
sin(60
o
−30
o
)sin(60
o
+30
o
)=4(
2
1
)(
2
1
)(1)=1
Similar questions