Math Problem Statement

How do i work out the exact value of tan(11pi/6)

Solution

To find the exact value of tan(11π6)\tan\left(\frac{11\pi}{6}\right), follow these steps:

  1. Express the angle in degrees: 11π6×180π=330\frac{11\pi}{6} \times \frac{180^\circ}{\pi} = 330^\circ So, 11π6\frac{11\pi}{6} radians is equivalent to 330330^\circ.

  2. Locate the angle on the unit circle: The angle 330330^\circ lies in the fourth quadrant. In this quadrant, tangent is negative because tangent is the ratio of sine to cosine, and sine is negative while cosine is positive in the fourth quadrant.

  3. Use a reference angle: The reference angle for 330330^\circ is 360330=30360^\circ - 330^\circ = 30^\circ. The tangent of the reference angle 3030^\circ is: tan(30)=13\tan(30^\circ) = \frac{1}{\sqrt{3}}

  4. Apply the sign based on the quadrant: Since 330330^\circ is in the fourth quadrant where tangent is negative, we get: tan(11π6)=13\tan\left(\frac{11\pi}{6}\right) = -\frac{1}{\sqrt{3}}

Thus, the exact value of tan(11π6)\tan\left(\frac{11\pi}{6}\right) is 13-\frac{1}{\sqrt{3}}.

Would you like more details or have any questions?


Here are 5 related questions you might find helpful:

  1. How do you determine the reference angle for any given angle?
  2. What are the signs of trigonometric functions in different quadrants?
  3. How can you convert radians to degrees and vice versa?
  4. What is the exact value of tan(5π6)\tan\left(\frac{5\pi}{6}\right)?
  5. How can you use the unit circle to find trigonometric values?

Tip: Always remember that in the fourth quadrant, sine is negative, cosine is positive, and tangent is negative.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Trigonometry
Unit Circle
Radians to Degrees Conversion

Formulas

tan(θ) = sin(θ) / cos(θ)
Radians to Degrees Conversion: θ radians × (180°/π)
Reference angle: 360° - θ for angles in the fourth quadrant

Theorems

Unit Circle Theorem
Reference Angle Theorem
Signs of Trigonometric Functions by Quadrant

Suitable Grade Level

Grades 9-12