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Problems
8.
cos
(
π
+
x
)
cos
(
−
x
)
sin
(
π
−
x
)
cos
(
π
2
+
x
)
=
cot
2
x
\frac{\cos (\pi+x) \cos (-x)}{\sin (\pi-x) \cos \left(\frac{\pi}{2}+x\right)}=\cot ^{2} x
s
i
n
(
π
−
x
)
c
o
s
(
2
π
+
x
)
c
o
s
(
π
+
x
)
c
o
s
(
−
x
)
=
cot
2
x
Mathematics
Problem
8.
cos
(
π
+
x
)
cos
(
−
x
)
sin
(
π
−
x
)
cos
(
π
2
+
x
)
=
cot
2
x
\frac{\cos (\pi+x) \cos (-x)}{\sin (\pi-x) \cos \left(\frac{\pi}{2}+x\right)}=\cot ^{2} x
s
i
n
(
π
−
x
)
c
o
s
(
2
π
+
x
)
c
o
s
(
π
+
x
)
c
o
s
(
−
x
)
=
cot
2
x
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