1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Mathematics
Property 6
Prove that:co...
Question
Prove that:
cos
3
2
x
+
3
cos
2
x
=
4
cos
6
x
-
sin
6
x
Open in App
Solution
RHS
=
4
cos
6
x
-
sin
6
x
=
4
cos
2
x
3
-
sin
2
x
3
Using the identity
a
3
-
b
3
=
a
-
b
a
2
+
a
b
+
b
2
, we get
=
4
cos
2
x
-
sin
2
x
cos
4
x
+
sin
4
x
+
sin
2
x
cos
2
x
=
4
cos
2
x
-
sin
2
x
cos
4
x
+
sin
4
x
+
sin
2
x
cos
2
x
=
4
cos
2
x
cos
2
x
-
sin
2
x
2
+
2
sin
2
x
cos
2
x
+
sin
2
x
cos
2
x
=
4
cos
2
x
cos
2
2
x
+
3
sin
2
x
cos
2
x
=
4
cos
2
x
cos
2
2
x
+
3
1
-
cos
2
x
2
1
+
cos
2
x
2
=
4
cos
2
x
cos
2
2
x
+
3
4
1
-
cos
2
2
x
=
cos
2
x
4
cos
2
2
x
+
3
1
-
cos
2
2
x
=
cos
2
x
4
cos
2
2
x
+
3
-
3
cos
2
2
x
=
cos
2
x
cos
2
2
x
+
3
=
cos
3
2
x
+
3
cos
2
x
=
LHS
Hence
proved
.
Suggest Corrections
12
Similar questions
Q.
Prove that:
sin
2
x
+
2
sin
4
x
+
sin
6
x
=
4
cos
2
x
sin
4
x
Q.
Prove the following:
sin 2x + 2 sin 4x + sin 6x = 4
cos
2
x sin 4x
Q.
Prove that
sin
x
2
x
+
2
sin
4
x
+
s
i
n
6
x
=
4
cos
2
x
.
sin
4
x
Q.
Prove that
sin
6
x
+
cos
6
x
=
1
−
3
sin
2
x
cos
2
x
Q.
Prove the following identities (1-16)
sin
6
x
+
cos
6
x
=
1
-
3
sin
2
x
cos
2
x
View More
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Property 6
MATHEMATICS
Watch in App
Explore more
Property 6
Standard XII Mathematics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app