sums and differences 108 videos

The Cosine Addition Formulas
Precalculus Advanced Trigonometry
How to derive the cosine of a difference formula.
the unit circle the law of cosines the distance formula cosine of a difference formula 
Exterior Angles of a Polygon
Geometry Polygons
How to find the sum of the exterior angles in a polygon and find the measure of one exterior angle in an equiangular polygon.
exterior angle sum of angles equiangular polygon 
Ohm's Law
Physics Electricity
How to use Ohm's law to relate potential difference and current flow.
ohm's law electric current potential difference 
Solving Exponential Equations with the Different Bases
Precalculus Exponential and Logarithmic Functions
Solving an exponential equation by taking the log of both sides.
exponential function log of both sides 
Solving Exponential Equations with the Different Bases
Algebra 2 Inverse, Exponential and Logarithmic Functions
Solving an exponential equation by taking the log of both sides.
exponential function log of both sides 
Supplementary and Complementary Angles
Geometry Geometry Building Blocks
How to identify supplementary and complementary angles.
angles sum right angle 
Series and Summation Notation
Algebra 2 Sequences and Series
How to define a series.
series sum of a sequence 
Series and Summation Notation
Precalculus Sequences and Series
How to define a series.
series sum of a sequence 
Overview of the Different Methods of Solving a Quadratic Equation
Algebra 2 Quadratic Equations and Inequalities
How to know which method to use when solving a quadratic equation.
factoring square root property completing the square quadratic formula pros cons comparison 
Permutations
Precalculus Topics in Discrete Math
How to find the number of permutations of a set.
different arrangement permutation factorial permute 
Permutations
Algebra 2 Combinatorics
How to find the number of permutations of a set.
different arrangement permutation factorial permute 
Sentence Types
Grammar Sentence Problems
The different types of sentences.
sentence types simple compound complex compound complex 
Literary Characters
Writing Writing Terms
The different types of characters.
characters static dynamic round flat antagonist protagonist 
Terrestrial Biomes
Biology Ecology
The different types of terrestrial biomes.
terrestrial biome tundra taiga tropical rainforest biome distribution 
Aquatic Biomes
Biology Ecology
The different types of aquatic biomes.
aquatic biome ecosystem freshwater saltwater littoral limnetic photic profundal aphotic benthic 
Elements and Compounds
Chemistry Matter
The differences between elements and compounds.
elements compounds 
Types of Reactions
Chemistry Chemical Reactions
The different types of chemical reactions.
types of reaction combustion synthesis decomposition