Question

What is the relationship between sine and cosine?

Answer 1

Relationship between sin and cos

Explanation:

There are many of them. Here are a few:

1. They are the projections of an variable arc x on the 2 x-axis and y-axis of the trig circle.

2. Trig identity: sin^2 x + cos ^2 x = 1

3. Complementary arcs: `sin (pi/2 - x) = cos x`