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\sin^{- 1} (\cos x)

এর অন্তরক সহগ কোনটি?

\frac{1}{\sqrt{1 - \cos^{2} x}}

\frac{- 1}{\sqrt{1 - \cos^{2} x}}

\frac{1}{\sqrt{1 - \sin^{2} x}}

-1

ANS : 4

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