• sin A + sin(x + 2) + sin(14
+ 3
Answers
Answered by
1
Answer:
We know that,
sin
(
7
π
14
)
=
sin
(
π
2
)
=
1
and take,
X=
sin
(
π
14
)
sin
(
3
π
14
)
sin
(
5
π
14
)
sin
(
9
π
14
)
sin
(
11
π
14
)
sin
(
13
π
14
)
Using
(
1
)
above ,we get
sin
(
3
π
14
)
=
cos
(
π
2
−
3
π
14
)
=
cos
(
4
π
14
)
=
cos
(
2
π
7
)
sin
(
5
π
14
)
=
cos
(
π
2
−
5
π
14
)
=
cos
(
2
π
14
)
=
cos
(
π
7
)
sin
(
9
π
14
)
=
cos
(
π
2
−
9
π
14
)
=
cos
(
−
2
π
14
)
=
cos
(
π
7
)
sin
(
11
π
14
)
=
cos
(
π
2
−
11
π
14
)
=
cos
(
−
4
π
14
)
=
cos
(
2
π
7
)
Similar questions