cot θ =\({ 7{} \over 8}\) అయితే, cos θ - sin θ విలువ ఎంత?

1
\({ {-1} \over \sqrt113}\)
2
\({ {1} \over \sqrt113}\)
3
\({ {2} \over \sqrt113}\)
4
\({ √(113) }\)

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