Find the principal solution of 3sec2x=sec x
x=0
x=π6
x=π3
no solution
3sec2x=sec xsec x=0 or sec x=13But sec x≥0 ∀ x The equation has no solutions.
Find the principal solution of cos 2x= sin x
Find the principal solution(s) of sec x sin2x=tan x
Find the principal solution of 1+cos xcos x=2