Solution
Expression : sec -5π/4 = x
$$\because sec(-x) = sec(x)$$
= $$sec(\frac{-5\pi}{4}) = sec(\frac{5 \pi}{4})$$
= $$sec(\pi + \frac{\pi}{4}) = -sec(\frac{\pi}{4})$$
= $$-\sqrt{2}$$
=> Ans - (B)
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