# Trigonometric equations and identities

This course is a part of
**Trigonometry**, a 5-course Topic series from Khan Academy.

Learn how to solve trigonometric equations and how to use trigonometric identities to solve various problems.

This course contains 7 segments:

**The inverse trigonometric functions**

Learn about the inverse functions of sine, cosine, and tangent, and how they are defined even though the functions are not really invertible. These functions will be very helpful when you will solve trigonometric equations.

**Solving basic sinusoidal equations**

Learn how to solve equations of the form sin(x)=d or cos(x)=d where d is any number. For example, solve sin(x)=0.6.

**Solving advanced sinusoidal equations**

Learn how to solve equations of the form a*sin(bx+c)=d or a*cos(bx+c)=d where a, b, c, and d are any number. For example, solve 5*sin(2x-1)=3.

**Solving sinusoidal models**

Solve word problems that involve sinusoidal modeling functions.

**Introduction to the trigonometric angle addition identities**

Learn about the trigonometric angle addition identities, which help us discuss the trig values of sums of angles in terms of the trig values of the individual angles. For example, we can express sin(x+y) in terms of sin(x), sin(y), cos(x), and cos(y).

**Using trigonometric identities to solve problems**

Learn about different ways in which trigonometric identities, such as the Pythagorean identity and the angle addition identities, can be used to solve problems.

**Challenging trigonometry problems**

See Sal solve a bunch of very challenging geometry and algebra problems that involve trigonometry.

## Get a Reminder

Rating | Not enough ratings |
---|---|

Length | 7 segments |

Starts | On Demand (Start anytime) |

Cost | Free |

From | Khan Academy |

Download Videos | On all desktop and mobile devices |

Language | English |

Subjects | Mathematics |

Tags | Math |

## Get a Reminder

## Similar Courses

## Careers

An overview of related careers and their average salaries in the US. Bars indicate income percentile.

## Write a review

Your opinion matters. Tell us what you think.

##### Please login to leave a review

Rating | Not enough ratings |
---|---|

Length | 7 segments |

Starts | On Demand (Start anytime) |

Cost | Free |

From | Khan Academy |

Download Videos | On all desktop and mobile devices |

Language | English |

Subjects | Mathematics |

Tags | Math |

## Similar Courses

Sorted by relevance

## Like this course?

Here's what to do next:

- Save this course for later
- Get
__more details__from the course provider - Enroll in this course