Match the trig identity to its result

Exercise and reference answers

Matching pairs

1. Left

   sin²θ + cos²θ

   Right

   1

2. Left

   1 + tan²θ

   Right

   sec²θ

3. Left

   1 + cot²θ

   Right

   cosec²θ

4. Left

   sin(2θ)

   Right

   2 sinθ cosθ

5. Left

   cos(2θ)

   Right

   cos²θ − sin²θ