26 Videos for "sums and differences"

The Sine Addition Formulas  Problem 2
Math › Trigonometry › Advanced Trigonometry
How to derive the sine of a difference formula and use it to find the sine of an angle. 
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. 
The Cosine Addition Formulas  Problem 3
Math › Precalculus › Advanced Trigonometry
How to evaluate cos(a ? b) and cos(a + b) when you know only sin(a) and cos(b). 
The Cosine Addition Formulas  Problem 3
Math › Trigonometry › Advanced Trigonometry
How to evaluate cos(a ? b) and cos(a + b) when you know only sin(a) and cos(b). 
The Sine Addition Formulas  Problem 3
Math › Trigonometry › Advanced Trigonometry
How to evaluate sin(a ? b) and sin(a + b) when you know only cos(a) and sin(b). 
The Sine Addition Formulas  Problem 3
Math › Precalculus › Advanced Trigonometry
How to evaluate sin(a ? b) and sin(a + b) when you know only cos(a) and sin(b).