Problem
6 Right triangle \( T M R \) is a scalene triangle with the right angle at \( M \). Which equation is true? (1) \( \sin M=\cos T \) (3) \( \sin T=\cos R \) (2) \( \sin R=\cos R \) (4) \( \sin T=\cos M \)
Solution
Step 1 ：Since \( T M R \) is a right triangle with right angle at \( M \)
Step 2 ：Utilize the relationship: \( \sin (90 - x) = \cos x \)
Step 3 ：Apply this relationship to the triangle: \( \sin R = \cos T \)
