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Problems
Mathematics
Mathematics
Problem
Solve
(
1
+
x
2
)
sec
2
y
d
y
+
2
x
tan
y
d
x
=
0
(1+x^2)\sec^2 y\, dy + 2x\tan y\, dx = 0
(
1
+
x
2
)
sec
2
y
d
y
+
2
x
tan
y
d
x
=
0
, given that
y
=
π
4
y = \frac{\pi}{4}
y
=
4
π
when
x
=
1
x = 1
x
=
1
.
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