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Mathematics
Problem
In Exercises 11-51, prove the identity. 46.
cos
x
1
+
sin
x
+
cos
x
1
−
sin
x
=
2
sec
x
\frac{\cos x}{1+\sin x}+\frac{\cos x}{1-\sin x}=2 \sec x
1
+
s
i
n
x
c
o
s
x
+
1
−
s
i
n
x
c
o
s
x
=
2
sec
x
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