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d= √x^2+y2
d=√3^2 + (-2)^2
d=√9 + 4
d=√13
d= 3,6
senθ= y/d
senθ= -2/3,6
senθ=- 0,55
θ= sen^-1(-0,55)
θ= 33,37
cosθ= x/d
cosθ= 3/3,6
cosθ= 0,83
θ= cos^-1 (0,83)
θ= 33,55
tanθ= y/x
tanθ= -2/3
tanθ= -0,66
θ= tan ^-1 (-0,66)
θ= 33,42
》b) Dado Tgθ= -4/5
d=√x^2 + x^2
d=√(-4)^2 + 5^2
d=√16+25
d=√41
d=6,4
senθ= y/d
senθ= 5/6,4
senθ= 0,78
θ= sen^-1 (0,78)
θ= 38,65
cosθ= x/d
cosθ= -4/6,4
cosθ= -0,625
θ= cos^-1 (-0,625)
θ= 38,65
tanθ= x/y
tanθ=- 4/5
tanθ= 0,8
θ= tan ^-1 (0,8)
θ=38,65