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Reduce the given expression to a single trigonometric function. $$ \sin t \cos t \tan t \sec t \cot t $$

Short Answer

Expert verified
The expression reduces to \( \sec t \).

Step by step solution

01

Simplify using trigonometric identities

First, recognize the trigonometric identities involved. We know that: \( \tan t = \frac{\sin t}{\cos t} \), \( \sec t = \frac{1}{\cos t} \), and \( \cot t = \frac{1}{\tan t} = \frac{\cos t}{\sin t} \). Let's substitute these identities into the expression.
02

Substitute identities into the expression

Rewrite the given expression by substituting the identities: \(\sin t \cos t \tan t \sec t \cot t = \sin t \cos t \left(\frac{\sin t}{\cos t}\right) \left(\frac{1}{\cos t}\right) \left(\frac{\cos t}{\sin t}\right)\).
03

Cancel out common terms

Now cancel out common terms in the expression: \( \sin t \cos t \frac{\sin t}{\cos t} \frac{1}{\cos t} \frac{\cos t}{\sin t} \). Here, \(\sin t\) and \(\cos t\) cancel each other, and what's left is \(\frac{1}{\cos t}\).
04

Simplify to a single function

The resulting expression simplifies to \(\frac{1}{\cos t}\). This is, by definition, the secant function. So the final expression reduces to \( \sec t \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Trigonometric Simplification
Trigonometric simplification involves reducing complex trigonometric expressions to simpler forms or even single functions. This simplification often relies on using well-known trigonometric identities. Identifying and appropriately applying these identities is crucial, as it can transform intricate calculations into straightforward math.

Many trigonometric expressions can be broken down using fundamental identities such as Pythagorean, reciprocal, and quotient identities. This process enables us to cancel out terms and simplify to an expression that is much easier to work with. For example, let's consider the identity \(\tan t = \frac{\sin t}{\cos t}\). By rewriting \(\tan t\) in terms of sine and cosine, it becomes possible to see how these terms interact with others in an expression for simplification.

The main goal is to find a single, more manageable function or expression that retains the original value, allowing for easier computation and understanding. It's a useful technique in various mathematical problems and real-world applications, such as signal processing and engineering.
Secant Function
The secant function is one of the six fundamental trigonometric functions. It is defined as the reciprocal of the cosine function. In mathematical terms, \(\sec t = \frac{1}{\cos t}\). This means when the cosine of an angle is small, the secant becomes large, and vice versa.

The graph of the secant function shows its basic behavior and periodic nature, repeating every \(2\pi\). However, unlike the sine and cosine functions, the secant function does not pass through zero and has vertical asymptotes, which occur where the cosine function is zero. These asymptotes reflect the values for which the secant function is undefined. Understanding the secant function’s properties can help us easily predict and calculate its values in more complex trigonometric expressions.

In a simplification context, recognizing the presence of \(\sec t\) or its equivalent \(\frac{1}{\cos t}\) enables the reduction of expressions like the provided one to a simpler form. This simplification is very helpful when dealing with expressions in calculus and advanced algebra where trigonometric functions play a big role.
Trigonometric Expressions
Trigonometric expressions involve combinations of trigonometric functions, such as sine, cosine, tangent, and their reciprocals: cosecant, secant, and cotangent. These expressions can range from simple to very complex based on the context and purpose.

Often, trigonometric expressions are encountered in problems involving angles and their properties, in physics, engineering, and other mathematical computations. The goal with these expressions is to make them as manageable as possible, often using identities to reduce, combine, or change the form of the initial equation.

In the given problem, the expression \(\sin t \cos t \tan t \sec t \cot t\) is a combination of five trigonometric functions. By applying the respective identities, each function is expressed in terms of \(\sin t\) and \(\cos t\), which reveals the simplicity lying beneath the complex expression. Understanding how these functions can be rewritten in terms of one another is the key to simplifying trigonometric expressions and reveals the elegant structure of trigonometry.

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Most popular questions from this chapter

Hours of Daylight The number \(H\) of daylight hours per day in various locations in the world can be modeled by a function of the form $$ H(t)=A \sin B(t-C)+D $$ where the variable \(t\) represents the number of days in a year corresponding to a specific calendar date (for example, February 1 corresponds to \(t=32\) In this problem we construct a model for Los Angeles, CA for the year 2017 (not a leap year) using data obtained from the U.S. Naval Observatory, Washington, D.C. (a) Find the amplitude \(A\) if 14.43 is the maximum number of daylight hours at the summer solstice and if 9.88 is the minimum number of daylight hours at the winter solstice. (b) Find \(B\) if the function \(H(t)\) is to have the period 365 days. (c) For Los Angeles in the year 2017 , we choose \(C\) \(=79 .\) Explain the significance of this number. [Hint: \(C\) has the same units as \(t\).] (d) Find \(D\) if the number of daylight hours at the vernal equinox for 2017 is 12.14 and occurs on March 20 (e) What does the model \(H(t)\) predict to be the number of daylight hours on January 1 ? On June 21 ? On August 1 ? On December 21 ? (f) Using a graphing utility to obtain the graph of \(H(t)\) on the interval [0,365] .

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