### Home > PC3 > Chapter Ch8 > Lesson 8.3.2 > Problem 8-99

8-99.

Verify the following trigonometric identities.

Substitute a Pythagorean Identity for

.

Substitute the Fundamental Pythagorean Identity into the left side of the equation for

.

8-99.

Verify the following trigonometric identities.

Substitute a Pythagorean Identity for

.

Substitute the Fundamental Pythagorean Identity into the left side of the equation for

.