Step-by-step explanation:
x^2 + y^2 = r^2 --> r =[tex]\sqrt{(-4)^2 + 5^2}[/tex] =[tex]\sqrt{41}[/tex]
cos = x /r = -4 /[tex]\sqrt{41}[/tex]
sin = y /r = 5/[tex]\sqrt{41}[/tex]
tan = sin /cos = -5 /4
