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Expression : sec -7π/4 = x
$$\because sec(-x) = sec(x)$$
= $$sec(\frac{-7\pi}{4}) = sec(\frac{7 \pi}{4})$$
= $$sec(2\pi - \frac{\pi}{4}) = sec(\frac{\pi}{4})$$
= $$\sqrt{2}$$
=> Ans - (A)
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