Provide an appropriate response.
A basic relationship between the sine value of an angle and the cosine value of the same angle is given as (sin A)2 + (cos A)2 = 1. Determine cos A if sin A = 0.3907.

A. 0.6093
B. 0.9205
C. 0.7806
D. 0.8474


Answer: B

Mathematics

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