Jeżeli tgα=3 to ile wynosi wyrażenie: 2sin α - cos α / cos α + 2sin α

tgα=3 sinα/cosα=3 cosα=1/3sinα 2sin α - cos α / cos α + 2sin α = =(2sinα-1/3sinα)/(1/3sinα+2sinα)= =(5/3sinα)/(7/3sinα)=5/7