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А) {45, 324}
б) {213, 45, 324, 732}
в) {324, 732, 136}
г) такое же, как б)
д) {}
(sin 4π/25 * cos π/25 + cos 4π/25 * sin π/25)/(cos 2π/5 * cos π/15 + sin 2π/5 * sin π/15)=sin(4π/25+π/25)/cos(2π/5-π/15)=sin(π/5)/cos(π/3)=sin(π/5):1/2=
=2sin(π/5)