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Mathematics
Mathematics
Problem
Show that:
cos
(
2
tan
−
1
1
7
)
=
sin
(
4
tan
−
1
1
3
)
\cos\left(2 \tan^{-1} \frac{1}{7}\right) = \sin\left(4 \tan^{-1} \frac{1}{3}\right)
cos
(
2
tan
−
1
7
1
)
=
sin
(
4
tan
−
1
3
1
)
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