Category: Trigonometry
"Published in Newark, California, USA"
Prove the trigonometric identity for
Solution:
In proving of trigonometric identities, you must choose the more complicated side of the equation and then simplify as much as you can until it is equal to the other side of the equation. In this case, consider the given equation
Let's expand and then simplify the left side of the equation as follows
but
The equation becomes
Therefore,