evaluate integral
ex cos3X DX plz solve this question
i know answer
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∫
e
5
x
cos
x
d
x
=
e
5
x
sin
x
−
∫
5
e
5
x
sin
x
d
x
=
e
5
x
sin
x
−
5
[
−
e
5
x
cos
x
−
∫
−
5
e
5
x
cos
x
d
x
]
=
e
5
x
sin
x
+
5
e
5
x
cos
x
-25
∫
e
5
x
cos
x
d
x
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