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Davis drew a unit circle and labeled the...

Davis drew a unit circle and labeled the cosine and sine of `45^(@)` as `((sqrt(2))/(2), (sqrt(2))/(2))`. As suming that Davis is correct, which of the following statements must be true?

A

`cos((pi)/(4))=(sqrt(2))/(2)`

B

`cos((pi)/(3))=(sqrt(2))/(2)`

C

`cos((pi)/(2))=(sqrt(2))/(2)`

D

`cos(pi)=(sqrt(2))/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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