Find the Other Trig Values in Quadrant I cos(x)=0

$\cos (x) = 0$

Step 1

Use the definition of cosine to find the known sides of the unit circle right triangle. The quadrant determines the sign on each of the values.

$\cos (x) = \frac{adjacent}{hypotenuse}$

Step 2

Find the opposite side of the unit circle triangle. Since the adjacent side and hypotenuse are known, use the Pythagorean theorem to find the remaining side.

$Opposite = \sqrt{{hypotenuse}^{2} - {adjacent}^{2}}$

Step 3

Replace the known values in the equation.

$Opposite = \sqrt{{(1)}^{2} - {(0)}^{2}}$

Step 4

Simplify inside the radical.

One to any power is one.

Opposite $= \sqrt{1 - {(0)}^{2}}$

Raising $0$ to any positive power yields $0$ .

Opposite $= \sqrt{1 - 0}$

Multiply $- 1$ by $0$ .

Opposite $= \sqrt{1 + 0}$

Add $1$ and $0$ .

Opposite $= \sqrt{1}$

Any root of $1$ is $1$ .

Opposite $= 1$

Step 5

Find the value of sine.

Use the definition of sine to find the value of $\sin (x)$ .

$\sin (x) = \frac{opp}{hyp}$

Substitute in the known values.

$\sin (x) = \frac{1}{1}$

Divide $1$ by $1$ .

$\sin (x) = 1$

Step 6

Find the value of tangent.

Use the definition of tangent to find the value of $\tan (x)$ .

$\tan (x) = \frac{opp}{adj}$

Substitute in the known values.

$\tan (x) = \frac{1}{0}$

Division by $0$ results in tangent being undefined at $x$ .

$\tan (x) = Undefined$

Undefined

Step 7

Find the value of cotangent.

Use the definition of cotangent to find the value of $\cot (x)$ .

$\cot (x) = \frac{adj}{opp}$

Substitute in the known values.

$\cot (x) = \frac{0}{1}$

Divide $0$ by $1$ .

$\cot (x) = 0$

Step 8

Find the value of secant.

Use the definition of secant to find the value of $\sec (x)$ .

$\sec (x) = \frac{hyp}{adj}$

Substitute in the known values.

$\sec (x) = \frac{1}{0}$

Division by $0$ results in secant being undefined at $x$ .

$\sec (x) = Undefined$

Undefined

Step 9

Find the value of cosecant.

Use the definition of cosecant to find the value of $\csc (x)$ .

$\csc (x) = \frac{hyp}{opp}$

Substitute in the known values.

$\csc (x) = \frac{1}{1}$

Divide $1$ by $1$ .

$\csc (x) = 1$

Step 10

This is the solution to each trig value.

Undefined

Find the Other Trig Values in Quadrant I cos(x)=0

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