Oblicz pozostale funkcje trygonometryczne,majac dane
a)cos alfa=3/5;0<alfa<90 stopni
b)tg alfa=12/13;0<alfa<90 stopni
a
cosα=3/5
sin²α+cos²α=1
sin²α+9/25=1
sin²α=16/25
sinα=4/5
tg=sinα/cosα=4/5/3/5=4/3
ctg=1/tg=3/4
b
tgα=12/13
ctg=13/12
tgα=sinα/cosα=12/13
12cosα=13sinα
sinα=(12/13)cosα
(12/13cosα)²+cos²α=1
(144/169)cos²α+cos²α=1
(313/169)cos²α=1
cos²α=169/313
cosα=13√313
sinα=12*13/13*√313=12/√313√
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a
cosα=3/5
sin²α+cos²α=1
sin²α+9/25=1
sin²α=16/25
sinα=4/5
tg=sinα/cosα=4/5/3/5=4/3
ctg=1/tg=3/4
b
tgα=12/13
ctg=13/12
tgα=sinα/cosα=12/13
12cosα=13sinα
sinα=(12/13)cosα
sin²α+cos²α=1
(12/13cosα)²+cos²α=1
(144/169)cos²α+cos²α=1
(313/169)cos²α=1
cos²α=169/313
cosα=13√313
sinα=12*13/13*√313=12/√313√