CALCULUS PRESENTED BY GUO CHENG GUANG（05-58）

Three methods to integrate ∫(sin(x))^2(cos(x))^4.

1.double/half angle formulae【sin(x))^2=(1-cos2x)/2,(cos(x))^2=(1+cos2x)/2)】

2.double/half angle formulae【sin2x=2sinxcosx,(cos(x))^2=(1+cos2x)/2)】

3.complex variable【z=cosθ+isinθ,z+1/z=2cosθ】

Calculus--Indefinite Integrals (05-58,S/N: 323) Presented By Guo Cheng Guang (aged 11) and Guo Chengxi (aged 8) in English. Lessons In Mathematics and Science (Physics, Chemistry and Biology) From Primary to University Presented By Guo Cheng Guang and Guo Chengxi In English. Your comment or suggestion is very much appreciated. https://www.youtube.com/channel/UC2dG5T9SJkUFTy-h0KbVbkw