reduce cos^4 x into an expression having 1st power of x
Answers
Answered by
0
Answer:
what is the question bro
muje kuch samaj nahi aaya fir se likho
Answered by
4
Answer:
cos
2
x
=
2
cos
2
x
−
1
cos
2
x
=
1
2
(
1
+
cos
2
x
)
cos
2
2
x
=
1
2
(
1
+
cos
4
x
)
cos
4
x
=
(
cos
2
x
)
2
=
1
4
(
1
+
2
cos
2
x
+
cos
2
2
x
)
cos
4
x
=
1
4
(
1
+
2
cos
2
x
+
1
2
(
1
+
cos
4
x
)
)
cos
4
x
=
1
8
(
3
+
4
cos
2
x
+
cos
4
x
)
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