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Объяснение:
Объяснение:
cos =8/17.
cos²α+sin²α=1;
Найдите значения:
sin α=√1-cos²α=√1-(8/17)²=√1-64/289=√289/289-64/289=√225/289=
=15/17.
sinα=15/17.
***
tg α= sinα/cosα=15/17 : 8/17=15*17:17*8=15/8=1 7/8.
tgα=1 7/8.
***
ctg α=1/tgα=1: 15/8=8/15.
ctgα=8/15.