Math Problem Statement

Simplify the trigonometric expression: \( \frac{\cot x \sec x}{\csc x} \).

Solution

Let's solve the given problem step by step.

We are tasked with simplifying:

cotxsecxcscx.\frac{\cot x \sec x}{\csc x}.

Step 1: Express trigonometric functions in terms of sinx\sin x and cosx\cos x

  • cotx=cosxsinx\cot x = \frac{\cos x}{\sin x},
  • secx=1cosx\sec x = \frac{1}{\cos x},
  • cscx=1sinx\csc x = \frac{1}{\sin x}.

Substituting these into the expression:

cotxsecxcscx=(cosxsinx)(1cosx)1sinx.\frac{\cot x \sec x}{\csc x} = \frac{\left(\frac{\cos x}{\sin x}\right) \left(\frac{1}{\cos x}\right)}{\frac{1}{\sin x}}.

Step 2: Simplify the numerator

In the numerator, cosxsinx1cosx\frac{\cos x}{\sin x} \cdot \frac{1}{\cos x}: cosxsinx1cosx=1sinx.\frac{\cos x}{\sin x} \cdot \frac{1}{\cos x} = \frac{1}{\sin x}.

So the expression becomes: 1sinx1sinx.\frac{\frac{1}{\sin x}}{\frac{1}{\sin x}}.

Step 3: Simplify the fraction

Dividing 1sinx\frac{1}{\sin x} by 1sinx\frac{1}{\sin x}: 1sinx1sinx=1.\frac{\frac{1}{\sin x}}{\frac{1}{\sin x}} = 1.

Final Answer:

1.\boxed{1}.

Let me know if you have further questions or want additional details!

Related Questions:

  1. What is the general approach to simplify trigonometric expressions?
  2. How do you derive reciprocal trigonometric identities?
  3. What are the applications of secx,cscx\sec x, \csc x in simplifying problems?
  4. Why does 1x\frac{1}{x} divided by 1x\frac{1}{x} simplify to 1?
  5. What are the domain restrictions for cotx\cot x and cscx\csc x?

Tip:

Always start simplifying trigonometric expressions by rewriting everything in terms of sinx\sin x and cosx\cos x for consistency.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Simplification of Trigonometric Expressions
Reciprocal Trigonometric Functions

Formulas

\( \cot x = \frac{\cos x}{\sin x} \)
\( \sec x = \frac{1}{\cos x} \)
\( \csc x = \frac{1}{\sin x} \)

Theorems

Basic Trigonometric Identities
Reciprocal and Quotient Identities

Suitable Grade Level

Grades 10-12