The cosine of 63 degrees is 0.45. What is the sine of 27 degrees?

Answer: 0.45

Explanation:

The rule is that

cos (x) = sin (y)

only if x+y = 90, where x and y are angles in degrees. In this case, x = 63 and y = 27, so x+y = 63+27 = 90, which fulfills the requirements needed to use the equation above.

Therefore,

cos (63) = 0.45 leads to sin (27) = 0.45