Question

Demuestra cada identidad:
A) sen x/tan x = cos x
B) sen x - sec x = tan x
C) cos²x (tan²x+1) = 1
D) sen x/cos x - tan x/ctg x = 1

Answer 1

senx/1/senx/cosx=cosx
senx.cosx/senx=cosx
cosx=cosx