Flip and match the double-angle pairs

Exercise and reference answers

Matching pairs

1. A

   sin(2x)

   B

   2 sin x cos x

2. A

   cos(2x)

   B

   cos^2 x - sin^2 x

3. A

   sin^2 x

   B

   (1 - cos 2x)/2

4. A

   cos^2 x

   B

   (1 + cos 2x)/2

Instructions

Tap two cards to flip them. Match each expression with an equal form.

Explanation