![multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange](https://i.stack.imgur.com/YYoni.png)
multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange
![Function Differentiation Using Chain Rule | Formula & Examples - Video & Lesson Transcript | Study.com Function Differentiation Using Chain Rule | Formula & Examples - Video & Lesson Transcript | Study.com](https://study.com/cimages/multimages/16/screen_shot_2022-02-01_at_10.42.15_am5388287897214045823.png)
Function Differentiation Using Chain Rule | Formula & Examples - Video & Lesson Transcript | Study.com
![Can someone explain to me why solving this derivative without using the double angle identity doesnt seem to work? Why cant I use the product and chain rule on the formula on Can someone explain to me why solving this derivative without using the double angle identity doesnt seem to work? Why cant I use the product and chain rule on the formula on](https://preview.redd.it/can-someone-explain-to-me-why-solving-this-derivative-v0-v7ytqhugbj9a1.jpg?auto=webp&s=60ec2908bbbdd14ee810373b51366fcaac95f02d)
Can someone explain to me why solving this derivative without using the double angle identity doesnt seem to work? Why cant I use the product and chain rule on the formula on
![multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange](https://i.stack.imgur.com/EFpcq.png)
multivariable calculus - Second order derivative of a chain rule (regarding reduction to canonical form) - Mathematics Stack Exchange
![Question Video: Differentiating Trigonometric Functions Using the Chain Rule and Double Angle Identity | Nagwa Question Video: Differentiating Trigonometric Functions Using the Chain Rule and Double Angle Identity | Nagwa](https://media.nagwa.com/209103287181/en/thumbnail_l.jpeg)
Question Video: Differentiating Trigonometric Functions Using the Chain Rule and Double Angle Identity | Nagwa
![Function Differentiation Using Chain Rule | Formula & Examples - Video & Lesson Transcript | Study.com Function Differentiation Using Chain Rule | Formula & Examples - Video & Lesson Transcript | Study.com](https://study.com/cimages/multimages/16/Chain-Rule-Working-From-The-Outside-In.jpg)