Which side of this equation is the most "complicated"?

$$2\ -\ \csc^2x\ =\ 1-\ \cot^2x$$  

Which substitution would you use to start this problem?

$$2\ -\ \csc^2x\ =\ 1-\ \cot^2x$$  

Which of the following approaches/advice do you think is most important to avoid mistakes on this problem?

$$2\ -\ \csc^2x\ =\ 1-\ \cot^2x$$  

Which side of this equation is the most "complicated"?

$$\tan x\ +\ \cot x\ =\ \sec x\csc x$$  

Which side of this equation is the most "complicated"?

$$\sec x+\tan x\ \ =\ \frac{\cos x}{1-\sin x}$$  

Which side is the "more complicated"?

$$\tan^3x=\tan x\sec^2x-\tan x$$  

Which side of this equation is the most "complicated"? $$\cos^3x\sin^4x\ \ =\ \left(\sin^4x-\sin^6x\right)\cos x$$