Consider the following statements : 1. If y=\ln ( \sec x+\tan x), then \frac{d y}{d x}= \sec x. 2. If y=\ln ({\cosec} x-\cot x), then \frac{d y}{d x}={\cosec} x. Which of the above is/are correct?

Correct Answer is : Both 1 and 2

UPSC NDA 2 2012 Mathematics Paper

Question : 69 of 120

Marks: +1, -0

Consider the following statements :
1. If y=ln( secx+tan‌x), then ‌

= secx.
2. If y=ln(cosec‌x−cot‌x), then ‌

=cosec‌x.
Which of the above is/are correct?

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