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Chapter 6 Example 13

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Chapter 6 Example 13

Posted by Suraj Kumar 6 years, 7 months ago

CBSE > Class 12 > Mathematics

3 answers

Suraj Kumar 6 years, 7 months ago

Thanks sahana and rahul..

Sahana Sankaranarayanan 6 years, 7 months ago

Given function is f(x) = sin x + cos x. When we differentiate we get f'(x) = cos x - sin x. Equate f'(x) = 0. You will get values of x. Given in the question is also about the interval in which x lies. So substitue the lowest limit, hogher limit and the values of x that you have found out in f'(x) = cos x - sin x. If the sign is +, then it increases in that interval, or if it is -, then it decreases in the interval.

Rahul Pal 6 years, 7 months ago

Cot x=1....,,then take its principal value

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