oblicz maria: -2sin150⁰.cos120⁰.tg180⁰ = tg225⁰.ctg330⁰ =

Basia: tg180⁰ =0 czyli całe pierwsze musi = 0 225⁰ = 180⁰+45⁰ 330⁰ = 360⁰-30⁰ tg225 = tg(180+45) = tg45=1 ctg330 = ctg(360-30) = - ctg30 = -√3 drugie = 1*(-√3) = -√3