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# Solutions for Chapter 4: Trigonometry

## Full solutions for Precalculus | 7th Edition

ISBN: 9780618643448

Solutions for Chapter 4: Trigonometry

Solutions for Chapter 4
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##### ISBN: 9780618643448

Chapter 4: Trigonometry includes 184 full step-by-step solutions. Since 184 problems in chapter 4: Trigonometry have been answered, more than 37496 students have viewed full step-by-step solutions from this chapter. This expansive textbook survival guide covers the following chapters and their solutions. This textbook survival guide was created for the textbook: Precalculus, edition: 7. Precalculus was written by and is associated to the ISBN: 9780618643448.

Key Calculus Terms and definitions covered in this textbook
• Basic logistic function

The function ƒ(x) = 1 / 1 + e-x

• Control

The principle of experimental design that makes it possible to rule out other factors when making inferences about a particular explanatory variable

• Descriptive statistics

The gathering and processing of numerical information

• Directrix of a parabola, ellipse, or hyperbola

A line used to determine the conic

• Factored form

The left side of u(v + w) = uv + uw.

• Infinite sequence

A function whose domain is the set of all natural numbers.

• Integers

The numbers . . ., -3, -2, -1, 0,1,2,...2

• Limit at infinity

limx: qƒ1x2 = L means that ƒ1x2 gets arbitrarily close to L as x gets arbitrarily large; lim x:- q ƒ1x2 means that gets arbitrarily close to L as gets arbitrarily large

• Linear equation in x

An equation that can be written in the form ax + b = 0, where a and b are real numbers and a Z 0

• Midpoint (in a coordinate plane)

For the line segment with endpoints (a,b) and (c,d), (aa + c2 ,b + d2)

• Multiplication principle of counting

A principle used to find the number of ways an event can occur.

• n-set

A set of n objects.

• Pythagorean

Theorem In a right triangle with sides a and b and hypotenuse c, c2 = a2 + b2

The graph in three dimensions of a seconddegree equation in three variables.

• Random behavior

Behavior that is determined only by the laws of probability.

• Real number

Any number that can be written as a decimal.

• Relation

A set of ordered pairs of real numbers.

• Resistant measure

A statistical measure that does not change much in response to outliers.

• Unit vector in the direction of a vector

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

• Vertices of an ellipse

The points where the ellipse intersects its focal axis.

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