Hard
Simplify: sin 70° / cos 20°
Explanation
Explanation
Since 70° and 20° are complementary angles (they add to 90°), sin 70° = cos 20° (co-function identity: sin θ = cos(90° - θ)). So sin 70° / cos 20° = 1.
PRO TIP
Re-check your working by substituting the answer back into the original question.