engineering recuitment NPCIL Plant Operator Mock Test Mathematics Trigonometry Trigonometric Functions

Find general solution of cos x = 1

1
x = 2nπ, n ∈ Z
2
x = 2nπ - 1, n ∈ Z
3
x = 2nπ + 1, n ∈ Z
4
None of the above
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