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Standard XI
Mathematics
NCERT
Question
Prove that:
s
i
n
x
+
s
i
n
3
x
+
s
i
n
5
x
+
s
i
n
7
x
=
4
c
o
s
x
c
o
s
2
x
s
i
n
4
x
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Solution
Verified by Toppr
L
H
S
=
s
i
n
x
+
s
i
n
3
x
+
s
i
n
5
x
+
s
i
n
7
x
=
s
i
n
x
+
s
i
n
7
x
+
s
i
n
3
x
+
s
i
n
5
x
=
2
sin
4
x
cos
3
x
+
2
sin
4
x
cos
x
=
2
sin
4
x
(
cos
3
x
+
cos
x
)
=
4
s
i
n
4
x
c
o
s
x
c
o
s
2
x
=
R
H
S
Hence proved
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Q1
Prove that:
s
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Q2
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