Byju's Answer
Standard XII
Mathematics
Greatest Integer Function
Prove that (C...
Question
Prove that (Cos 6x + 6 cos 4x + 15 cos 2x + 10) / (cos5x + 5 cos 3x+ 10 cos x) =2cosx
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Q.
The expression
cos
6
x
+
6
cos
4
x
+
15
cos
2
x
+
10
cos
5
x
+
5
cos
3
x
+
10
cos
x
is equal to
Q.
1
+
cos
2
x
+
cos
4
x
+
cos
6
x
−
4
cos
x
cos
2
x
cos
3
x
=
Q.
Prove that
cos
4
x
+
cos
3
x
+
cos
2
x
sin
4
x
+
sin
3
x
+
sin
2
x
=
cot
3
x
Q.
Solve:
sin
8
x
cos
x
−
sin
6
x
cos
3
x
cos
2
x
cos
x
−
sin
3
x
sin
4
x
=
tan
2
x
Q.
Let
y
=
cos
x
+
cos
2
x
+
cos
3
x
+
cos
4
x
+
cos
5
x
+
cos
6
x
+
cos
7
x
sin
x
+
sin
2
x
+
sin
3
x
+
sin
4
x
+
sin
5
x
+
sin
6
x
+
sin
7
x
,
then which of the following hold good?
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