I have no idea how to do this help please

1. cos70°. 2. cos57°

3. cos45°. 4. cos35°

5. cos30°

Step-by-step explanation:

sin20°≈0.342. 0.342≈cos70°

sin33°≈0.545. 0.545≈cos57°

sin45°≈0.707. 0.707≈cos45°

sin55°≈0.819. 0.819≈cos35°

sin60°≈0.866. 0.866≈cos30°

your answer would be b

step-by-step explanation:

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