naomihiggins8783
16.12.2021 •
Mathematics
Evaluate the function requested. Write your answer as a fraction in lowest terms.
Triangle A B C. Angle C is 90 degrees. Hypotenuse A B is 123, adjacent B C is 27, opposite A C is 120.
Find cos B.
a.
Cosine B = StartFraction 40 Over 41 EndFraction
c.
Cosine B = StartFraction 9 Over 40 EndFraction
b.
Cosine B = StartFraction 41 Over 40 EndFraction
d.
Cosine B = StartFraction 9 Over 41 EndFraction
Please select the best answer from the choices provided
A
B
C
D
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Ответ:
z = 6
Step-by-step explanation:
Using the cofunction identity
sin x = cos(90 - x)
That is the 2 angles are complementary, thus
9z - 1 + 6z + 1 = 90, that is
15z = 90 ( divide both sides by 15 )
z = 6