If f(x) = 24 + 2? + x² D
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Answer:
f(x+y)⋅f(x−y)
=(
2
2
x+y
+2
−(x+y)
)(
2
2
x−y
+2
−(x−y)
)
=
4
1
(2
2x
+2
2y
+2
−2x
+2
−2y
)
=
2
1
[
2
1
(2
2x
+2
−2x
)+
2
1
(
2y
+2
−2y
)]
=
2
1
[f(2x)+f(2y)].
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