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Mathematics
Mathematics
Problem
11. If
y
=
5
cos
x
−
3
sin
x
y=5 \cos x-3 \sin x
y
=
5
cos
x
−
3
sin
x
, prove that
d
2
y
d
x
2
+
y
=
0
\frac{d^{2} y}{d x^{2}}+y=0
d
x
2
d
2
y
+
y
=
0
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