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Ex 5.1, 32 - Show that f(x) = |cos x| is continuous - Class 12

Ex 5.1, 32 - Chapter 5 Class 12 Continuity and Differentiability - Part 2


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Ex 5.1, 32 Show that the function defined by 𝑓 (𝑥)= |cos⁡𝑥 | is a continuous function.𝑓(𝑥) = |cos⁡𝑥 | Let 𝒈(𝒙) = |𝑥| & 𝒉(𝒙) = cos⁡𝑥 Now, 𝒈𝒐𝒉(𝒙) = g(ℎ(𝑥)) = 𝑔(cos⁡𝑥 ) = |cos⁡𝑥 | = 𝒇(𝒙) Hence, 𝑓(𝑥) = 𝑔𝑜ℎ(𝑥) We know that, 𝒉(𝒙) = cos⁡𝑥 is continuous as cos is continuous & 𝒈(𝒙) = |𝑥| is continuous as it is a modulus function Hence, 𝑔(𝑥) & ℎ(𝑥) are both continuous . We know that If two function of 𝑔(𝑥) & ℎ(𝑥) both continuous, then their composition 𝒈𝒐𝒉(𝒙) is also continuous Hence, 𝒇(𝒙) is continuous . .

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.