If sec = x+1/4x prove cos^2 + cos^4 = 1
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0
Answer:
Explanation:
L
H
S
:
sin
4
x
−
cos
4
x
=
(
sin
2
x
−
cos
2
x
)
(
sin
2
x
+
cos
2
x
)
->factor
=
(
sin
2
x
−
cos
2
x
)
⋅
1
=
(
1
−
cos
2
x
)
−
cos
2
x
->use the property
sin
2
x
+
cos
2
x
=
1
=
1
−
2
cos
2
x
=
R
H
S
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