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Question
If
f
(
x
)
=
3
cos
3
x
, show that
9
f
(
x
)
+
f
′′
(
x
)
=
0
.
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Video Explanation
NCEA Level 3 Calculus Differentiation 2018 NZQA Exam - Worked Answers
by infinityplusone
(starts at 1:56)
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