Misc 8 - Differentiate cos (a cos x + b sin x) - Chapter 5 Class 12 - Miscellaneous part 2 - Misc  8 - Miscellaneous - Serial order wise - Chapter 5 Class 12 Continuity and Differentiability

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Misc 8 Differentiate 𝑀.π‘Ÿ.𝑑. π‘₯ the function, cos ⁑(π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯), for some constant π‘Ž and 𝑏. Let 𝑦 = cos ⁑(π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) Differentiating 𝑀.π‘Ÿ.𝑑.π‘₯. 𝑑𝑦/𝑑π‘₯ = (𝑑(cos((a cos⁑x+b sin⁑x )))/𝑑π‘₯ 𝑑𝑦/𝑑π‘₯ = βˆ’sin⁑π‘₯ (π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) . (𝑑⁑(π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯))/𝑑π‘₯ = βˆ’sin⁑π‘₯ (π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) . (π‘Ž .𝑑⁑(cos⁑π‘₯ )/𝑑π‘₯+𝑏 .𝑑⁑(sin⁑π‘₯ )/𝑑π‘₯) = βˆ’sin⁑π‘₯ (π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) . (π‘Ž(βˆ’sin⁑π‘₯ )+𝑏 (cos⁑π‘₯ )) = βˆ’sin⁑π‘₯ (π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) . (βˆ’π‘Ž sin⁑π‘₯+𝑏 cos⁑π‘₯ ) = βˆ’sin⁑π‘₯ (π‘Ž cos⁑π‘₯+𝑏 sin⁑π‘₯) . βˆ’(π‘Ž sin⁑π‘₯βˆ’π‘ cos⁑π‘₯ ) = 𝐬𝐒𝐧⁑〖 (𝒂 𝒄𝒐𝒔⁑𝒙+𝒃 π’”π’Šπ’β‘π’™)" " (𝒂 π’”π’Šπ’β‘π’™βˆ’π’ƒ 𝒄𝒐𝒔⁑𝒙 )γ€—

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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 14 years. He provides courses for Maths, Science and Computer Science at Teachoo