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# Solutions for Chapter 8.2: THE DOUBLE-ANGLE FORMULAS

## Full solutions for Precalculus: With Unit Circle Trigonometry (with Interactive Video Skillbuilder CD-ROM) (Available 2010 Titles Enhanced Web Assign) | 4th Edition

ISBN: 9780534402303

Solutions for Chapter 8.2: THE DOUBLE-ANGLE FORMULAS

Solutions for Chapter 8.2
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##### ISBN: 9780534402303

Precalculus: With Unit Circle Trigonometry (with Interactive Video Skillbuilder CD-ROM) (Available 2010 Titles Enhanced Web Assign) was written by and is associated to the ISBN: 9780534402303. Chapter 8.2: THE DOUBLE-ANGLE FORMULAS includes 68 full step-by-step solutions. This expansive textbook survival guide covers the following chapters and their solutions. This textbook survival guide was created for the textbook: Precalculus: With Unit Circle Trigonometry (with Interactive Video Skillbuilder CD-ROM) (Available 2010 Titles Enhanced Web Assign), edition: 4. Since 68 problems in chapter 8.2: THE DOUBLE-ANGLE FORMULAS have been answered, more than 24674 students have viewed full step-by-step solutions from this chapter.

Key Calculus Terms and definitions covered in this textbook
• Arctangent function

See Inverse tangent function.

• Coefficient of determination

The number r2 or R2 that measures how well a regression curve fits the data

• Complex number

An expression a + bi, where a (the real part) and b (the imaginary part) are real numbers

• Damping factor

The factor Ae-a in an equation such as y = Ae-at cos bt

• Data

Facts collected for statistical purposes (singular form is datum)

• Elimination method

A method of solving a system of linear equations

• Ellipse

The set of all points in the plane such that the sum of the distances from a pair of fixed points (the foci) is a constant

• Natural logarithmic function

The inverse of the exponential function y = ex, denoted by y = ln x.

• Parallelogram representation of vector addition

Geometric representation of vector addition using the parallelogram determined by the position vectors.

• Periodic function

A function ƒ for which there is a positive number c such that for every value t in the domain of ƒ. The smallest such number c is the period of the function.

• PH

The measure of acidity

• Polynomial function

A function in which ƒ(x)is a polynomial in x, p. 158.

• Reciprocal identity

An identity that equates a trigonometric function with the reciprocal of another trigonometricfunction.

• Sample standard deviation

The standard deviation computed using only a sample of the entire population.

• Solution of an equation or inequality

A value of the variable (or values of the variables) for which the equation or inequality is true

• Standard form: equation of a circle

(x - h)2 + (y - k2) = r 2

• Sum of two vectors

<u1, u2> + <v1, v2> = <u1 + v1, u2 + v2> <u1 + v1, u2 + v2, u3 + v3>

• Symmetric matrix

A matrix A = [aij] with the property aij = aji for all i and j

• Tangent

The function y = tan x

• Unit vector in the direction of a vector

A unit vector that has the same direction as the given vector.

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