3 sin a -sin3a =4 sin a/(1+cot square a)
Answers
Answered by
1
Step-by-step explanation:
I think , It is an identity to prove.
L
H
S
=
sin
6
x
+
cos
6
x
=
(
sin
2
x
)
3
+
(
cos
2
x
)
3
=
(
sin
2
x
+
cos
2
x
)
3
−
3
sin
2
x
cos
2
x
(
sin
2
x
+
cos
2
x
)
=
(
1
)
3
−
3
sin
2
x
cos
2
x
⋅
(
1
)
=
1
−
3
sin
2
x
cos
2
x
=
R
H
S
Proved
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