If cos65° = 0.4226, then sin25° =_____________. Explain the reasoning used to answer this question.

Question

If cos65° = 0.4226, then sin25° =_____________. Explain the reasoning used to answer this question.

Answer 1

sin 25° = 0.4226

This is the reasoning: The sine of any acute angle is equal to the cosine of its complement. The cosine of any acute angle is equal to the sine of its complement.