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Problem
Problem
Solve the equation
(
cos
x
−
sin
x
)
(
2
tan
x
+
1
cos
x
)
+
2
=
0
(\cos x - \sin x) \left( 2 \tan x + \frac{1}{\cos x} \right) + 2 = 0
(
cos
x
−
sin
x
)
(
2
tan
x
+
cos
x
1
)
+
2
=
0
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