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Mathematics
Mathematics
Problem
If
a
2
−
2
a
cos
x
+
1
=
674
a^2 - 2a \cos x + 1 = 674
a
2
−
2
a
cos
x
+
1
=
674
and
tan
(
x
2
)
=
7
\tan\left(\frac{x}{2}\right) = 7
tan
(
2
x
)
=
7
then the integral value of
a
a
a
is a. 25 b. 49 c. 67 d. 74
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