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JAMB Mathematics 2017 Paper
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© africaexams.com
Question : 7
Total: 44
If y = x Sin x, find
d
y
d
x
when x =
π
2
−
π
2
-1
1
π
2
Validate
Solution:
y = xsinx
d
y
d
x
=
1
s
i
n
x
+
x
\
c
o
s
x
=
s
i
n
x
+
x
\
c
o
s
x
At x =
π
2
= sin
π
2
+
π
2
\
c
o
s
π
2
= 1 +
π
2
× 0
= 1
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