Ex 5.2, 7 - Chapter 5 Class 12 Continuity and Differentiability

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Ex 5.2, 7 Differentiate the functions with respect to 𝑥 2√(cot ( 𝑥2 )) Let 𝑦 = " " 2√(cot ( 𝑥2 )) We need to find derivative of 𝑦 𝑤.𝑟.𝑡.𝑥 𝑦′ = (2√(cot ( 𝑥^2 ) ) )^′ = 2(√(cot ( 𝑥^2 ) ) )^′ = 2 1/(2√(cot ( 𝑥^2 ) )) . (cot ( 𝑥^2 ))^′ = 1/√(cot ( 𝑥^2 ) ) .(−𝑐𝑜𝑠𝑒𝑐^2 (𝑥^2 )) . ( 𝑥^2 ) = 1/√(cot ( 𝑥^2 ) ) . (−𝑐𝑜𝑠𝑒𝑐^2 (𝑥^2)) . 2𝑥 = (−2𝑥" " 𝑐𝑜𝑠𝑒𝑐^2 𝑥^2)/√(cot ( 𝑥^2 ) ) = (−2𝑥)/(sin^2⁡(𝑥^2 ) . √( 〖cos 〗⁡〖(𝑥^2)〗/〖sin 〗⁡〖(𝑥^2)〗 ) ) "= " (−2𝑥)/(〖𝑠𝑖𝑛 〗⁡(𝑥^2 ) × 〖𝑠𝑖𝑛 〗⁡(𝑥^2 ) √( 〖cos 〗⁡〖(𝑥^2)〗/〖sin 〗⁡〖(𝑥^2)〗 ) ) " " = (− 2𝑥 )/(〖sin 〗⁡〖(𝑥)^2 〗 ×√(〖sin^2 〗⁡〖(𝑥^2)〗 × 〖cos 〗⁡〖(𝑥^2)〗/sin⁡〖 (𝑥^2)〗 )) = (− 2𝑥 )/(〖sin 〗⁡〖(𝑥)^2 〗 ×√(〖cos 〗⁡〖(𝑥^2)〗 sin⁡〖 (𝑥^2)〗 )) = (− 2𝑥 )/(〖sin 〗⁡〖(𝑥)^2 〗 ×√(2/2 × 〖cos 〗⁡〖(𝑥^2)〗 sin⁡〖 (𝑥^2)〗 )) = (− 2√2 𝑥 )/(〖sin 〗⁡〖(𝑥)^2 〗 ×√(2 〖cos 〗⁡〖(𝑥^2)〗 sin⁡〖 (𝑥^2)〗 )) = (− 𝟐√𝟐 𝒙 )/(〖𝐬𝐢𝐧 〗⁡〖(𝒙)^𝟐 〗 ×√(〖𝒔𝒊𝒏 〗⁡〖(𝟐𝒙^𝟐)〗 )) (As sin 2θ = 2 sin θ cos θ)