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

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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