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Problem
Problem
Find the number of integral values of
k
k
k
for which equation
7
cos
x
+
5
sin
x
=
2
k
+
1
7 \cos x + 5 \sin x = 2k + 1
7
cos
x
+
5
sin
x
=
2
k
+
1
has at least one solution.
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