Подскажите пож в тригонометрии
Sin5n/6 * cos5n/7 * tg5n/8 * ctg5n/9
Sin5n/6 * cos5n/7 * tg5n/8 * ctg5n/9=sin(n-1п/6)*cos(n-2п/7)*tg(n-3п/8)*ctg(n-4п/9)=
=sinп/|6*cos2п/7*tg3п/8*ctg4п/9=1/2*cos2п/7*tg3п/8*ctg4п/9
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Sin5n/6 * cos5n/7 * tg5n/8 * ctg5n/9=sin(n-1п/6)*cos(n-2п/7)*tg(n-3п/8)*ctg(n-4п/9)=
=sinп/|6*cos2п/7*tg3п/8*ctg4п/9=1/2*cos2п/7*tg3п/8*ctg4п/9