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Math

Unit 1

Trigonometry

Beginner Trigonometry Trigonometric Identities Trigonometric Functions Solving Trigonometric Equations

Unit 2

Calculus

Beginner Calculus Differentiation Integration Applications of Calculus

Unit 1 • Chapter 2

Trigonometric Identities

Video Summary

In this video, the author introduces 4 trigonometric identities: 1. Sine squared theta + cosine squared theta = 1 2. Tan squared theta + 1 = 1/secant squared theta 3. Sine of theta/cosine of theta = tangent of theta 4. Secant of theta = 1/cosine of theta

Knowledge Check

What is the Pythagorean theorem?

a theorem stating that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides

a theorem stating that in a right triangle, the square of the sine of an angle is equal to the square of the cosine of the angle

a theorem stating that in a right triangle, the square of the tangent of an angle is equal to the square of the secant of the angle

a theorem stating that in a right triangle, the square of the cosecant of an angle is equal to the square of the cotangent of the angle

What is the tangent of an angle?

sine of the angle divided by cosine of the angle

cosine of the angle divided by sine of the angle

hypotenuse divided by opposite side

adjacent side divided by opposite side

What is the secant of an angle?

1 divided by cosine of the angle

cosine of the angle divided by 1

hypotenuse divided by opposite side

adjacent side divided by opposite side

Math

Trigonometric Identities

Video Summary

Knowledge Check

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Trigonometric Functions

Beginner Trigonometry