Complete the complementary angle rules

Exercise and reference answers

Missing parts

1. Answer

   sin x

   Choices

   1. sin x
   2. cos x
   3. tan x

2. Answer

   cos x

   Choices

   1. cos x
   2. sin x
   3. cot x

Complete the statement

cos(π/2 − x) equals {0}, and sin(π/2 − x) equals {1}.

Explanation