Find Trig Functions Using Identities tan(theta)=-3/5 , cos(theta)>0

$\tan (θ) = - \frac{3}{5}$ , $\cos (θ) > 0$

The cosine function is positive in the first and fourth quadrants. The tangent function is negative in the second and fourth quadrants. The set of solutions for $θ$ are limited to the fourth quadrant since that is the only quadrant found in both sets.

Solution is in the fourth quadrant.

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

$\tan (θ) = \frac{opposite}{adjacent}$

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

$Hypotenuse = \sqrt{{opposite}^{2} + {adjacent}^{2}}$

Replace the known values in the equation.

$Hypotenuse = \sqrt{{(- 3)}^{2} + {(5)}^{2}}$

Simplify inside the radical.

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Raise $- 3$ to the power of $2$ .

Hypotenuse $= \sqrt{9 + {(5)}^{2}}$

Raise $5$ to the power of $2$ .

Hypotenuse $= \sqrt{9 + 25}$

Add $9$ and $25$ .

Hypotenuse $= \sqrt{34}$

Find the value of sine.

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

$\sin (θ) = \frac{opp}{hyp}$

Substitute in the known values.

$\sin (θ) = \frac{- 3}{\sqrt{34}}$

Simplify the value of $\sin (θ)$ .

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Move the negative in front of the fraction.

$\sin (θ) = - \frac{3}{\sqrt{34}}$

Multiply $\frac{3}{\sqrt{34}}$ by $\frac{\sqrt{34}}{\sqrt{34}}$ .

$\sin (θ) = - (\frac{3}{\sqrt{34}} \cdot \frac{\sqrt{34}}{\sqrt{34}})$

Combine and simplify the denominator.

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Multiply $\frac{3}{\sqrt{34}}$ and $\frac{\sqrt{34}}{\sqrt{34}}$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Raise $\sqrt{34}$ to the power of $1$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Raise $\sqrt{34}$ to the power of $1$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\sin (θ) = - \frac{3 \sqrt{34}}{{\sqrt{34}}^{1 + 1}}$

Add $1$ and $1$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{{\sqrt{34}}^{2}}$

Rewrite ${\sqrt{34}}^{2}$ as $34$ .

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Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{34}$ as $34^{\frac{1}{2}}$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{{(34^{\frac{1}{2}})}^{2}}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{34^{\frac{1}{2} \cdot 2}}$

Combine $\frac{1}{2}$ and $2$ .

$\sin (θ) = - \frac{3 \sqrt{34}}{34^{\frac{2}{2}}}$

Cancel the common factor of $2$ .

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Cancel the common factor.

$\sin (θ) = - \frac{3 \sqrt{34}}{34^{\frac{2}{2}}}$

Rewrite the expression.

$\sin (θ) = - \frac{3 \sqrt{34}}{34}$

Evaluate the exponent.

$\sin (θ) = - \frac{3 \sqrt{34}}{34}$

Find the value of cosine.

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Use the definition of cosine to find the value of $\cos (θ)$ .

$\cos (θ) = \frac{adj}{hyp}$

Substitute in the known values.

$\cos (θ) = \frac{5}{\sqrt{34}}$

Simplify the value of $\cos (θ)$ .

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Multiply $\frac{5}{\sqrt{34}}$ by $\frac{\sqrt{34}}{\sqrt{34}}$ .

$\cos (θ) = \frac{5}{\sqrt{34}} \cdot \frac{\sqrt{34}}{\sqrt{34}}$

Combine and simplify the denominator.

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Multiply $\frac{5}{\sqrt{34}}$ and $\frac{\sqrt{34}}{\sqrt{34}}$ .

$\cos (θ) = \frac{5 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Raise $\sqrt{34}$ to the power of $1$ .

$\cos (θ) = \frac{5 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Raise $\sqrt{34}$ to the power of $1$ .

$\cos (θ) = \frac{5 \sqrt{34}}{\sqrt{34} \sqrt{34}}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\cos (θ) = \frac{5 \sqrt{34}}{{\sqrt{34}}^{1 + 1}}$

Add $1$ and $1$ .

$\cos (θ) = \frac{5 \sqrt{34}}{{\sqrt{34}}^{2}}$

Rewrite ${\sqrt{34}}^{2}$ as $34$ .

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Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{34}$ as $34^{\frac{1}{2}}$ .

$\cos (θ) = \frac{5 \sqrt{34}}{{(34^{\frac{1}{2}})}^{2}}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\cos (θ) = \frac{5 \sqrt{34}}{34^{\frac{1}{2} \cdot 2}}$

Combine $\frac{1}{2}$ and $2$ .

$\cos (θ) = \frac{5 \sqrt{34}}{34^{\frac{2}{2}}}$

Cancel the common factor of $2$ .

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Cancel the common factor.

$\cos (θ) = \frac{5 \sqrt{34}}{34^{\frac{2}{2}}}$

Rewrite the expression.

$\cos (θ) = \frac{5 \sqrt{34}}{34}$

Evaluate the exponent.

$\cos (θ) = \frac{5 \sqrt{34}}{34}$

Find the value of cotangent.

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

$\cot (θ) = \frac{adj}{opp}$

Substitute in the known values.

$\cot (θ) = \frac{5}{- 3}$

Move the negative in front of the fraction.

$\cot (θ) = - \frac{5}{3}$

Find the value of secant.

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

$\sec (θ) = \frac{hyp}{adj}$

Substitute in the known values.

$\sec (θ) = \frac{\sqrt{34}}{5}$

Find the value of cosecant.

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

$\csc (θ) = \frac{hyp}{opp}$

Substitute in the known values.

$\csc (θ) = \frac{\sqrt{34}}{- 3}$

Move the negative in front of the fraction.

$\csc (θ) = - \frac{\sqrt{34}}{3}$

This is the solution to each trig value.

$\sin (θ) = - \frac{3 \sqrt{34}}{34}$

$\cos (θ) = \frac{5 \sqrt{34}}{34}$

$\tan (θ) = - \frac{3}{5}$

$\cot (θ) = - \frac{5}{3}$

$\sec (θ) = \frac{\sqrt{34}}{5}$

$\csc (θ) = - \frac{\sqrt{34}}{3}$

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