Answer:
option 1 --> sec A = c/a
option 3 --> sin(b) = b/c
option 4 --> Sin(A) = a/c
Explanation:
Since cos is adjacent, we know the legs are a and b and the hypotenuse is c
For angle B
- sin (opposite over hypotenuse) = b/c
- tan (opposite over adjacent) = b/a
- csc (hypotenuse over opposite) = c/b
- sec (hypotenuse over adjacent) = c/b
- cot (adjacent over opposite) = a/b
For Angle A
- sin = a/c
- cos = b/c
- tan = a/b
- csc = c/a
- sec = c/b
- cot = b/a