RRB NTPC · வினா 52

\(sin\;x = \frac{4}{5}\) என்றால் sec2 x - 1 =? A. \(\frac{{16}}{{25}}\) B. \(\frac{{25}}{{9}}\) C. \(\frac{{9}}{{16}}\) D. \(\frac{{16}}{{9}}\)

1. A

   A

2. B

   D

3. C

   B

4. D

   C