જો \(\rm \cos\left(\cot^{-1}{1\over5}\right) = \sin\left(\tan^{-1}X\right)\) હોય, તો X શોધો.

1
\(\rm {5\over 4}\)
2
5
3
\(\rm {4\over 5}\)
4
\(\rm 1\over 5\)

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