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Oblicz sinα + cosα
sinα/cosα=4/3→sinα=4/3*cosα
sin²α+cos²α=1
(4/3cosα)²+cos²α=1
16/9 cos²α+cos²α=1
25/9 cos²α=1
cos²α=9/25
cosα=3/5
sinα=4/5
sinα + cosα=4/5+3/5=7/5=1 i 2/5
4^2+3^2=c^2
c^2=16+9=25
c=5
czyli sinα=4/5
a cosα=3/5
czyli sinα+cosα=4/5+3/5=7/5=1i2/5