Respuesta :

sin α = opposite leg/ hypotenuse

Terminal side forms a hypotenuse of a triangle.
x- coordinate gives adjacent leg,
y-coordinate gives opposite leg. (-8)

Hypotenuse ² = (leg1)² +(leg2)²
Hypotenuse ² = 15² +(-8)² = 289
Hypotenuse =√289 = 17

sin α = - 8/17


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