Answer:
The answer to your question is: sin Ф = -0.8745
Step-by-step explanation:
cos Ф = -0.485 π < Ф < 2π ; 180 < Ф < 360
Cosine is negative in the second and third quadrangle, but we need to find the quadrangle only in the third quadrangle.
cos Ф = adjacent side / hypotenuse
-0.485/ 1 = adjacent side / hypotenuse
adjacent side = -0.485
hypotenuse = 1
- Calculate the opposite side
c² = a² + b²
a² = c² - b²
a² = 1² - (-0.485)²
a² = 1 - 0.235
a² = 0.7648
Opposite side = a = - 0.8745, but is negative in the third quadrangle.
sin Ф = -0.8745 / 1
sin Ф = -0.8745
