Answer:
B
Step-by-step explanation:
We can find y first in the right triangle using the Pythagorean Theorem
5² = 4²+y²
25 -16 = y²
√9 = √y²
3 = y
A. sinY = opposite side of angle y / hypothenuse = 3/5 ≠4/5
B. tanX = opposite side of angle x/ adjacent side to the angle x = 4/3
C. sin²Y -cos²Y = 1 ; (3/5)² -( 4/5)² = 9-16/ 25 = 7/25 ≠ 1
cosY = adjacent side to angle Y/ hypothenuse = 4/5
D. cosX =adjacent side to angle X/ hypothenuse = 3/5 ≠ 5/3
