Question

Which equation is trigonometric identity

Answer 1

`\boxed{\sin^2x+\cos^2x=1}`

`\sin^2x=\cos^2x+1\ WRONG\\\sin^2x=1-\cos^2x\ CORRECT\\---------------------------\\\tan x=(\cos x)/(\sin x)\ WRONG\\\tan x=(\sin x)/(\cos x)\ CORRECT\\-------------------------\\(\sin x+\cos x)^2=1\ WRONG\\\sin^2x+\cos^2x=1\ CORRECT`