Hard
Simplify: sin 40° / cos 50°
Explanation
Explanation
Since 40° and 50° are complementary angles (they add to 90°), sin 40° = cos 50° (co-function identity: sin θ = cos(90° - θ)). So sin 40° / cos 50° = 1.
PRO TIP
Re-check your working by substituting the answer back into the original question.