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Law of Cosines: When to Use It and How to Apply It

Trigonometry: Master Angles, Functions & Applications

Imaginary and Complex Numbers

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Introduction to imaginary numbers

Complex numbers and complex planes

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Adding and subtracting complex numbers

Complex conjugates

Complex Conjugates

Multiplying and dividing complex numbers

Distance and midpoint of complex numbers

Angle and absolute value of complex numbers

Polar form of complex numbers

Operations on complex numbers in polar form

Inverse Trigonometric Functions

Finding inverse trigonometric function from its graph

Evaluating inverse trigonometric functions

Finding inverse reciprocal trigonometric function from its graph

Finding exact value of inverse reciprocal trig functions

Inverse Reciprocal Trigonometric Function: Finding the Exact Value

Inverse reciprocal trigonometric function: finding the exact value

Bearings

Introduction to bearings

Bearings and direction word problems

Bearings and Direction Word Problems

Angle of elevation and depression

Trigonometric Ratios and Angle Measure

Unit circle

Law of sines

Ambiguous case: SSA triangles

Law of cosines

Applications of the sine law and cosine law

Angle in standard position

Coterminal angles

Coterminal Angles

Reference angle

Find the exact value of trigonometric ratios

ASTC rule in trigonometry (All Students Take Calculus)

ASTC rule in trigonometry

ASTC rule in trigonometry (All Students Take Calculus)

Converting between degrees and radians

Trigonometric ratios of angles in radians

Radian measure and arc length

Graphing Trigonometric Functions

Sine graph: y = sin x

Cosine graph: y = cos x

Tangent graph: y = tan x

Cotangent graph: y = cot x

Secant graph: y = sec x

Cosecant graph: y = csc x

Graphing transformations of trigonometric functions

Determining trigonometric functions given their graphs

Applications of Trigonometric Functions

Ferris wheel trig problems

Tides and water depth trig problems

Spring (simple harmonic motion) trig problems

Trigonometric Identities

Quotient identities and reciprocal identities

Pythagorean identities

Sum and difference identities

Sum and Difference Identities

Double-angle identities

Cofunction identities

Solving Trigonometric Equations

Solving first degree trigonometric equations

Solving second degree trigonometric equations

Solving trigonometric equations involving multiple angles

Determining non-permissible values for trig expressions

Solving trigonometric equations using pythagorean identities

Solving trigonometric equations using Pythagorean identities

Solving trigonometric equations using sum and difference identities

Solving trigonometric equations using double-angle identities

Right Triangle Trigonometry

Use sine ratio to calculate angles and sides (Sin = \(  \frac{o}{h}\) )

Use cosine ratio to calculate angles and sides (Cos =  \(  \frac{a}{h}\)  )

Combination of SohCahToa questions

Word problems relating ladder in trigonometry

Word problems relating guy wire in trigonometry

Solving expressions using 45-45-90 special right triangles

Solving expressions using 30-60-90 special right triangles 

Use tangent ratio to calculate angles and sides (Tan =  \(  \frac{o}{a}\)  )

Parent Assignments

Challenge Zone

Foundation Review

Our Trigonometry tutors have you covered with our complete trig help for all topics that you would expect in any typical Trigonometry classes, whether it&apos;s <a href="http://www.nysedregents.org/a2trig/home.html">Trigonometry Regents exam (EngageNY)</a>, <a href="http://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html">ACT Trigonometry</a>, or College Trigonometry. Learn trig with ease!

Our online trigonometry tutorials walk you through all topics in trigonometry like the Unit Circle, Trigonometric Identities, Trigonometric functions, Right triangle trigonometry, Trigonometric equations, and so much more. Learn the concepts with our trig tutorials that show you step-by-step solutions to even the hardest trigonometry problems. Then, reinforce your understanding with tons of trigonometry practice. 

All our lessons are taught by experienced Trigonometry teachers. Let&apos;s finish your homework in no time, and ACE that final.

sample

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Ex.1

Bearing problem with ambiguous case using law of sines

Ex.2

Finding an angle using the cosine rule given all three sides

intro

Intro to the law of cosines and its derivation from the Pythagorean theorem

There are times when the Law of Sines cannot solve the triangle because we encounter a triangle with either one of the following two scenarios &ndash; SAS (Side-angle-side), or SSS (Side-Side-Side). What should we do then? We consider using the <a href='[[glossary.html|{"keyword":"Law of Cosines"}]]'>Law of Cosines</a>, which is another formula that models the relationship between the sides and the angles of any triangle. In this section, we will learn about the concept and the usage of the Law of Cosines, also known as the Cosines Rule.

Cosine law

Cosine rule

Understanding the law of cosines