Medium
Simplify: sin 25° / cos 65°
Explanation
Explanation
Since 25° and 65° are complementary angles (they add to 90°), sin 25° = cos 65° (co-function identity: sin θ = cos(90° - θ)). So sin 25° / cos 65° = 1.
PRO TIP
Re-check your working by substituting the answer back into the original question.