• #### Trigonometric Identities - Problem 2

##### Math›Precalculus›Trigonometric Functions
How to use the unit circle to show that cosine is an even function, and sine and tangent are odd functions.
• #### The Sine Addition Formulas - Problem 2

How to derive the sine of a difference formula and use it to find the sine of an angle.
• #### Solving Trigonometric Equations - Problem 3

How to solve a simple trig equation involving secant.
• #### Graphing the Reciprocal Trigonometric Functions - Problem 1

##### Math›Trigonometry›Trigonometric Functions
How to graph y = sec q.
• #### Simplifying Rational Functions with Factoring and GCFs - Problem 15

##### Math›Algebra›Rational Expressions and Functions
Using opposite binomials to simplify rational expressions.
Tags:
• #### Graphing the Reciprocal Trigonometric Functions - Problem 1

##### Math›Precalculus›Trigonometric Functions
How to graph y = sec q.
• #### Simplifying Rational Functions with Factoring and GCFs - Problem 11

##### Math›Algebra›Rational Expressions and Functions
Using opposite binomials to reduce rational expressions and find excluded values.
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• #### Finding an Inverse Algebraically - Problem 7

##### Math›Algebra 2›Inverse, Exponential and Logarithmic Functions
Inverse functions of even powers are done by switching x and y, taking the opposite root, and then rationalizing the denominator.
• #### Simplifying Rational Functions with Factoring and GCFs - Concept

##### Math›Algebra›Rational Expressions and Functions
How to simplify rational expressions.
• #### Addition and Scalar Multiplication of Vectors - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to compute the difference of two vectors.
• #### Addition and Scalar Multiplication of Vectors - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to compute the difference of two vectors using scalar multiplication to take the opposite vector.
• #### Rate Word Problems - Problem 1

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about airplanes leaving opposite cities and moving toward each other.
• #### Simplifying Rational Functions with Factoring and GCFs - Problem 3

##### Math›Algebra›Rational Expressions and Functions
How to simplify rational expressions when both the numerator and denominator need to be factored.
• #### Solving a Rational Equation - Problem 2

##### Math›Algebra 2›Rational Expressions and Functions
How to solve a rational equation involving opposite denominators with an extraneous solution.
• #### Simplifying Rational Functions with Factoring and GCFs - Problem 1

##### Math›Algebra›Rational Expressions and Functions
How to simplify rational expressions when there is a monomial common factor.
• #### Simplifying Rational Functions with Factoring and GCFs - Problem 2

##### Math›Algebra›Rational Expressions and Functions
How to simplify rational expressions when the numerator or denominator needs to be factored.
• #### Cyclic Quadrilaterals and Parallel Lines in Circles - Concept

##### Math›Geometry›Circles
How to prove that opposite angles in a cyclic quadrilateral are congruent; how to prove that parallel lines create congruent arcs in a circle.