Math Problem Statement

The point given below is on the terminal side of an angle theta in standard position. Find the exact value of each of the six trigonometric functions of theta. (5, -3)

Solution

To find the six trigonometric functions of θ\theta, we need to determine the values of sinθ\sin \theta, cosθ\cos \theta, tanθ\tan \theta, cscθ\csc \theta, secθ\sec \theta, and cotθ\cot \theta for an angle whose terminal side passes through the point (5,3)(5, -3).

  1. Calculate rr:
    r=x2+y2=52+(3)2=25+9=34r = \sqrt{x^2 + y^2} = \sqrt{5^2 + (-3)^2} = \sqrt{25 + 9} = \sqrt{34}.

  2. Trigonometric Ratios:

    • sinθ=yr=334=334\sin \theta = \frac{y}{r} = \frac{-3}{\sqrt{34}} = -\frac{3}{\sqrt{34}}.
    • cosθ=xr=534=534\cos \theta = \frac{x}{r} = \frac{5}{\sqrt{34}} = \frac{5}{\sqrt{34}}.
    • tanθ=yx=35=35\tan \theta = \frac{y}{x} = \frac{-3}{5} = -\frac{3}{5}.
  3. Reciprocal Trigonometric Ratios:

    • cscθ=ry=343=343\csc \theta = \frac{r}{y} = \frac{\sqrt{34}}{-3} = -\frac{\sqrt{34}}{3}.
    • secθ=rx=345\sec \theta = \frac{r}{x} = \frac{\sqrt{34}}{5}.
    • cotθ=xy=53=53\cot \theta = \frac{x}{y} = \frac{5}{-3} = -\frac{5}{3}.

Thus, the values of the six trigonometric functions of θ\theta are:

  • sinθ=334\sin \theta = -\frac{3}{\sqrt{34}}
  • cosθ=534\cos \theta = \frac{5}{\sqrt{34}}
  • tanθ=35\tan \theta = -\frac{3}{5}
  • cscθ=343\csc \theta = -\frac{\sqrt{34}}{3}
  • secθ=345\sec \theta = \frac{\sqrt{34}}{5}
  • cotθ=53\cot \theta = -\frac{5}{3}

Would you like further details on any of these steps, or do you have any questions?

  1. How is rr calculated in trigonometric functions?
  2. Why are reciprocal trigonometric functions used?
  3. What are the signs of trigonometric functions in different quadrants?
  4. How does standard position affect the trigonometric function values?
  5. Why is it important to simplify the square root in trigonometry?

Tip: Remember, in standard position, the terminal side's location (quadrant) determines the sign of each trigonometric function.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Cartesian Coordinates
Trigonometric Ratios
Reciprocal Trigonometric Functions

Formulas

r = √(x^2 + y^2)
sin θ = y/r
cos θ = x/r
tan θ = y/x
csc θ = r/y
sec θ = r/x
cot θ = x/y

Theorems

Pythagorean Theorem

Suitable Grade Level

Grades 10-12