what is the cos4x-sin4x
Answers
Answered by
1
Answer:
To prove that
cos
4
x
−
sin
4
x
=
1
−
2
sin
2
x
, we'll need the Pythagorean identity and a variation on the Pythagorean identity:
⇒
cos
2
x
+
sin
2
x
=
1
⇒
cos
2
x
=
1
−
sin
2
x
Step-by-step explanation:
L
H
S
=
cos
4
x
−
sin
4
x
L
H
S
=
(
cos
2
x
)
2
−
(
sin
2
x
)
2
L
H
S
=
(
cos
2
x
+
sin
2
x
)
(
cos
2
x
−
sin
2
x
)
L
H
S
=
1
⋅
(
cos
2
x
−
sin
2
x
)
L
H
S
=
cos
2
x
−
sin
2
x
L
H
S
=
1
−
sin
2
x
−
sin
2
x
L
H
S
=
1
−
2
sin
2
x
L
H
S
=
R
H
S
That's the proof. Hope this helped!
william22:
you are dum
Answered by
2
answer is given below
we can use here the formula between sin and cos
♒♒♒♒♒♒♒♒♒
♒♒♒♒♒♒♒♒♒
in the other hand
we can change in other tactic
♒♒♒♒♒♒♒♒♒
♒♒♒♒♒♒♒♒♒
the answer is 0 ✔✔✔✔✔
✨✨hope it helps✨✨
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