Given right triangle ABC with right angle C and cos A= 1/3, which of the following expressions is also equal to 1/3? a. sinB
b. sin(90°-A)
c. sin(90°-B)
d. Both A and B are correct

D

Step-by-step explanation:

So we know that:

To co-function identities state that:

Therefore, this is the same as:

B is correct.

Additionally, recall that in a right triangle, the two other angles must add up to 90. In other words:

Subtract A from both sides:

So we can make the substitution:

Thus, A is also correct.

The correct answer is D .

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).