For general solutions
We must learn
For sin x = sin y,
x = nπ + (–1) n y, where n ∈ Z
For cos x = cos y ,
x = 2nπ ± y, where n ∈ Z
For tan x = tan y,
x = nπ + y, where n ∈ Z
Note : Here n ∈ Z means n is an integer





Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class