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Byju's Answer
Standard XII
Mathematics
Cos(A+B)Cos(A-B)
Write cos 4...
Question
Write
cos
4
θ
in terms of
cos
θ
.
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Solution
We have,
cos
4
θ
=
2
cos
2
2
θ
−
1
=
2
(
2
cos
2
θ
−
1
)
2
−
1
=
8
cos
4
θ
−
8
cos
2
θ
+
1
.
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Q.
Express
cos
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Q.
If
(
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The number of solutions of the equation
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is
Q.
Solve :
c
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s
θ
+
c
o
s
2
θ
+
c
o
s
3
θ
+
c
o
s
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θ
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i
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n
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Cos(A+B)Cos(A-B)
Standard XII Mathematics
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