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cos 2x > 0,5 <=> 2x ∈ ( -60⁰ +k*360⁰; 60⁰ + k*360⁰ ) <=>
<=> x ∈ (-30⁰ + k*180⁰; 30⁰ + k*180⁰ ), gdzie k - liczba całkowita.
lub
cos 2x > 0,5 <=> x ∈ ( -π/6 + k*π ; π/6 + k*π) , k - liczba
całkowita.