Last updated at Aug. 11, 2021 by Teachoo

Transcript

Ex 8.2, 2 Choose the correct option and justify your choice : (iv) (2 π‘ππβ‘γ30Β°γ)/(1 β tan^2β‘γ30Β°γ ) (A) cos 60Β° (B) sin 60Β° (C) tan 60Β° (D) sin 30Β° We know that , tan "30Β°" = 1/β3 So, (2 tanβ‘γ30Β°γ)/(1 β π‘ππ2 30Β°) = (2 Γ (1/β3))/(1 β (1/β3)^2 ) = (2/β3)/(1 β 1/3) = (2/β3)/(2/3) = 2/β3Γ3/2 = 2/β3Γ(β3 Γ β3)/2 = β3 Options are (A) cos 60Β° (B) sin 60Β° (C) tan 60Β° (D) sin 30Β° Since tan "60Β°" =β3 Hence, option (C) is correct

Ex 8.2

Ex 8.2, 1 (i)

Ex 8.2, 1 (ii)

Ex 8.2, 1 (iii)

Ex 8.2, 1 (iv) Important

Ex 8.2, 1 (v) Important

Ex 8.2, 2 (i) (MCQ)

Ex 8.2, 2 (ii) (MCQ)

Ex 8.2, 2 (iii) (MCQ) Important

Ex 8.2, 2 (iv) (MCQ) You are here

Ex 8.2, 3 Important

Ex 8.2, 4 (i) Important

Ex 8.2, 4 (ii) Important

Ex 8.2, 4 (iii)

Ex 8.2, 4 (iv)

Ex 8.2, 4 (v) Important

About the Author

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.