Question 88

(secA - 1)/(secA + 1) is equal to?

Solution

Expression : (secA - 1)/(secA + 1)

= $$(\frac{1}{cosA}-1)\div(\frac{1}{cosA}+1)$$

= $$(\frac{1-cosA}{cosA})\div(\frac{1+cosA}{cosA})$$

= $$(\frac{1-cosA}{cosA}) \times (\frac{cosA}{1+cosA})$$

= $$\frac{1-cosA}{1+cosA}$$

=> Ans - (D)

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