# Ex 2.2, 2 - Chapter 2 Class 12 Inverse Trigonometric Functions (Term 1)

Last updated at May 12, 2021 by Teachoo

Last updated at May 12, 2021 by Teachoo

Transcript

Ex 2.2, 2 3cosโ1 ๐ฅ = cosโ1 (4๐ฅ^3โ 3๐ฅ ), ๐ฅโ [1/2,1] Solving R.H.S cos^(โ1) (4๐ฅ^3โ 3๐ฅ ) Putting x = cos ๐ = cos^(โ1) (4 ใ"cos" ใ^๐๐ โ 3cos ๐) = cos^(โ1) (cos 3๐) = 3๐ = 3 cos^(โ1) x (cos 3x = 4 cos^3x โ 3 cos x) Now, x = cos ๐ โด cos^(โ1) (x) = ๐ = L.H.S Hence, proved.

Ex 2.2

Ex 2.2,1
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Chapter 2 Class 12 Inverse Trigonometric Functions (Term 1)

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.