Evaluate cos^2 46 + cos^2 44
Answers
Answered by
0
Cos double angle formula:
cos
2
θ
=
cos
2
θ
−
sin
2
θ
So in this case let
θ
be
44
degrees
cos
2
(
44
°
)
−
sin
2
(
44
°
)
=
cos
(
2
⋅
44
°
)
=
cos
(
88
°
)
Answer linkCos double angle formula:
cos
2
θ
=
cos
2
θ
−
sin
2
θ
So in this case let
θ
be
44
degrees
cos
2
(
44
°
)
−
sin
2
(
44
°
)
=
cos
(
2
⋅
44
°
)
=
cos
(
88
°
)
Answered by
2
Answer:
cos²46+cos²44= cos²(90-44)+cos²44
=sin²44+cos²44= 1(Ans)
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