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Mathematics
Problem
In Exercises 73-78, confirm the identity. 74.
1
+
cos
t
1
−
cos
t
=
1
+
cos
t
∣
sin
t
∣
\sqrt{\frac{1+\cos t}{1-\cos t}}=\frac{1+\cos t}{|\sin t|}
1
−
c
o
s
t
1
+
c
o
s
t
=
∣
s
i
n
t
∣
1
+
c
o
s
t
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