93 Videos for "identities"

Square Matrices  Problem 3
Math › Precalculus › Systems of Linear Equations and Matrices
How to show that two matrices are inverses (in the sense of matrix multiplication). 
The Sine Addition Formulas  Problem 2
Math › Precalculus › Advanced Trigonometry
How to derive the sine of a difference formula and use it to find the sine of an angle. 
Solving Trigonometric Equations  Problem 3
Math › Precalculus › Advanced Trigonometry
How to solve a simple trig equation involving secant. 
Solving Trigonometric Equations  Problem 1
Math › Trigonometry › Advanced Trigonometry
How to solve a simple cosine equation: cos x = ?2/2. 
Solving Trigonometric Equations  Problem 1
Math › Precalculus › Advanced Trigonometry
How to solve a simple cosine equation: cos x = ?2/2. 
Other Forms of the Cosine DoubleAngle Formula  Concept
Math › Precalculus › Advanced Trigonometry
How to derive two more cosine doubleangle formulas. 
The Number e and the Natural Logarithm  Problem 2
Math › Precalculus › Exponential and Logarithmic Functions
How to evaluate natural logarithms of e to a power. 
The Inverse of a Square Matrix  Problem 2
Math › Precalculus › Systems of Linear Equations and Matrices
How to determine that a matrix has no inverse using row operations. 
The Inverse of a Square Matrix  Problem 1
Math › Precalculus › Systems of Linear Equations and Matrices
How to find the inverse of a square matrix of order 2 using row operations. 
The Inverse of a Square Matrix  Problem 3
Math › Precalculus › Systems of Linear Equations and Matrices
How to find the inverse of a square matrix of order 3 using row operations. 
Other Forms of the Cosine DoubleAngle Formula  Concept
Math › Trigonometry › Advanced Trigonometry
How to derive two more cosine doubleangle formulas. 
The Euler Formula  Problem 3
Math › Precalculus › Polar Coordinates and Complex Numbers
How to derive two trigonometric identities using Euler's Formula. 
Solving Linear Systems Using Matrix Algebra  Concept
Math › Precalculus › Systems of Linear Equations and Matrices
How to convert a system of linear equations into a matrix equation and solve it.