1. If Cos(a)=Sin(52), what is the value of A?
A. 28
B. 38
C. 52
D. 128

2. If Sin B=7/9, what is Cos A?
Cos A=

What must be true about A and ?
A. a and b are complementary angles
B. mC. mD. a and b are suplementary angles

Part 1) Option B. 38°

Part 2) Cos A=7/9 ( A and B are complementary angles)

Step-by-step explanation:

Part 1)  If Cos(A)=Sin(52), what is the value of A?

we know that

If two angles are complementary, the cofunction identities state that the sine of one equals the cosine of the other and vice versa

so

If Cos(A)=Sin(52)

then

solve for A

Part 2) If Sin B=7/9, what is Cos A?

Cos A=____

In this problem we have that

Angle A and Angle B are complementary angles

so

Remember that

If two angles are complementary, the cofunction identities state that the sine of one equals the cosine of the other and vice versa

so

If Sin B=7/9

then

Cos A=7/9

21 i watched a 3 hr vid explaining it

step-by-step explanation:

du what else would it be

brainliest

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square