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Mathematics
Mathematics
Problem
If
sin
2
A
=
x
\sin^2 A = x
sin
2
A
=
x
and
∏
r
=
1
4
sin
(
r
A
)
=
a
x
2
+
b
x
3
+
c
x
4
+
d
x
5
\prod_{r=1}^{4} \sin(rA) = ax^2 + bx^3 + cx^4 + dx^5
∏
r
=
1
4
sin
(
r
A
)
=
a
x
2
+
b
x
3
+
c
x
4
+
d
x
5
, then the value of
10
a
−
7
b
+
15
c
−
5
d
10a - 7b + 15c - 5d
10
a
−
7
b
+
15
c
−
5
d
must be
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