Question 80

If sec -7π/4 = x, then the value of x is

Solution

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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