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Mathematics
Mathematics
Problem
d
d
x
(
sec
x
+
tan
x
sec
x
−
tan
x
)
=
\frac{d}{dx} \left(\frac{\sec x + \tan x}{\sec x - \tan x}\right) =
d
x
d
(
s
e
c
x
−
t
a
n
x
s
e
c
x
+
t
a
n
x
)
=
(a)
2
cos
x
(
1
−
sin
x
)
2
\frac{2\cos x}{(1 - \sin x)^2}
(
1
−
s
i
n
x
)
2
2
c
o
s
x
(b)
cos
x
(
1
−
sin
x
)
2
\frac{\cos x}{(1 - \sin x)^2}
(
1
−
s
i
n
x
)
2
c
o
s
x
(c)
2
cos
x
1
−
sin
x
\frac{2\cos x}{1 - \sin x}
1
−
s
i
n
x
2
c
o
s
x
(d) None of these
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