Example 16 - Chapter 1 Class 12 Relation and Functions - NCERT Find gof and fog, if f : R → R and g : R → R are given by f (x) = cos x and g (x) = 3x^2. Show that gof ≠ fog. f(x) = cos x , g(x) = 3x^2 fog f(x) = cos x f(g(x)) = cos g(x) fog = cos 3x^2 gof g(x) = 3x^2 g(f(x)) = 3 f(x)^2 gof = 3 cos^2 x Hence, gof ≠ fog.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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