Trigonometry Examples

f (x) = - 2 sin (5 θ) + 1

$f (x) = - 2 \sin (5 θ) + 1$

Step 1

Use the form

a sin (b θ - c) + d

$a \sin (b θ - c) + d$ to find the variables used to find the amplitude, period, phase shift, and vertical shift.

a = - 2

$a = - 2$

b = 5

$b = 5$

c = 0

$c = 0$

d = 1

$d = 1$

Step 2

Find the amplitude

| a |

$| a |$ .

Amplitude:

2

$2$

Step 3

Find the period using the formula

\frac{2 π}{| b |}

$\frac{2 π}{| b |}$ .

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Step 3.1

Find the period of

- 2 sin (5 θ)

$- 2 \sin (5 θ)$ .

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Step 3.1.1

The period of the function can be calculated using

\frac{2 π}{| b |}

$\frac{2 π}{| b |}$ .

\frac{2 π}{| b |}

$\frac{2 π}{| b |}$

Step 3.1.2

Replace

b

$b$ with

5

$5$ in the formula for period.

\frac{2 π}{| 5 |}

$\frac{2 π}{| 5 |}$

Step 3.1.3

The absolute value is the distance between a number and zero. The distance between

0

$0$ and

5

$5$ is

5

$5$ .

\frac{2 π}{5}

$\frac{2 π}{5}$

\frac{2 π}{5}

$\frac{2 π}{5}$

Step 3.2

Find the period of

1

$1$ .

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Step 3.2.1

The period of the function can be calculated using

\frac{2 π}{| b |}

$\frac{2 π}{| b |}$ .

\frac{2 π}{| b |}

$\frac{2 π}{| b |}$

Step 3.2.2

Replace

b

$b$ with

5

$5$ in the formula for period.

\frac{2 π}{| 5 |}

$\frac{2 π}{| 5 |}$

Step 3.2.3

The absolute value is the distance between a number and zero. The distance between

0

$0$ and

5

$5$ is

5

$5$ .

\frac{2 π}{5}

$\frac{2 π}{5}$

\frac{2 π}{5}

$\frac{2 π}{5}$

Step 3.3

The period of addition/subtraction of trig functions is the maximum of the individual periods.

\frac{2 π}{5}

$\frac{2 π}{5}$

\frac{2 π}{5}

$\frac{2 π}{5}$

Step 4

Find the phase shift using the formula

\frac{c}{b}

$\frac{c}{b}$ .

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Step 4.1

The phase shift of the function can be calculated from

\frac{c}{b}

$\frac{c}{b}$ .

Phase Shift:

\frac{c}{b}

$\frac{c}{b}$

Step 4.2

Replace the values of

c

$c$ and

b

$b$ in the equation for phase shift.

Phase Shift:

\frac{0}{5}

$\frac{0}{5}$

Step 4.3

Divide

0

$0$ by

5

$5$ .

Phase Shift:

0

$0$

Phase Shift:

0

$0$

Step 5

List the properties of the trigonometric function.

Amplitude:

2

$2$

Period:

\frac{2 π}{5}

$\frac{2 π}{5}$

Phase Shift: None

Vertical Shift:

1

$1$

Step 6