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a) cos x =1
x=0+2kπ i x∈(-2 π ;2 π )
x=-2π ; x=0 ; x=2π
b) tg x=√3
x=π/3+kπ i x∈(-2 π ;2 π )
x=-5/3π; x=-2/3π; x=π/3; x=4/3π