CCSS IP Math II 5.9.4 Example 1
Prove the Pythagorean identity sin cos.
- Draw a labeled diagram of a right triangle.
- Apply the Pythagorean Theorem to this triangle.
- Divide both sides of this equation by .
- Rewrite this equation using the laws of exponents.
- Find sin and cos by looking at the diagram.
- Substitute sin and cos into the equation from step 4.
- Rewrite the equation using the standard notation for trigonometric functions with exponents.