Evaluate cos(theta)+sin(theta)*tan(theta)=2

$\cos (θ) + \sin (θ) \cdot \tan (θ) = 2$

Simplify the left side.

Simplify each term.

Rewrite $\tan (θ)$ in terms of sines and cosines.

$\cos (θ) + \frac{\sin (θ) \sin (θ)}{\cos (θ)} = 2$

Multiply $\sin (θ) \frac{\sin (θ)}{\cos (θ)}$ .

Raise $\sin (θ)$ to the power of $1$ .

$\cos (θ) + \frac{\sin^{1} (θ) \sin (θ)}{\cos (θ)} = 2$

Raise $\sin (θ)$ to the power of $1$ .

$\cos (θ) + \frac{\sin^{1} (θ) \sin^{1} (θ)}{\cos (θ)} = 2$

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

$\cos (θ) + \frac{{\sin (θ)}^{1 + 1}}{\cos (θ)} = 2$

Add $1$ and $1$ .

$\cos (θ) + \frac{\sin^{2} (θ)}{\cos (θ)} = 2$

Multiply both sides of the equation by $\cos (θ)$ .

$\cos (θ) (\cos (θ) + \frac{\sin^{2} (θ)}{\cos (θ)}) = \cos (θ) \cdot 2$

Apply the distributive property.

$\cos (θ) \cos (θ) + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

Multiply $\cos (θ) \cos (θ)$ .

Raise $\cos (θ)$ to the power of $1$ .

$\cos^{1} (θ) \cos (θ) + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

Raise $\cos (θ)$ to the power of $1$ .

$\cos^{1} (θ) \cos^{1} (θ) + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

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

${\cos (θ)}^{1 + 1} + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

Add $1$ and $1$ .

$\cos^{2} (θ) + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

Cancel the common factor of $\cos (θ)$ .

Cancel the common factor.

$\cos^{2} (θ) + \cos (θ) \frac{\sin^{2} (θ)}{\cos (θ)} = \cos (θ) \cdot 2$

Rewrite the expression.

$\cos^{2} (θ) + \sin^{2} (θ) = \cos (θ) \cdot 2$

Rearrange terms.

$\sin^{2} (θ) + \cos^{2} (θ) = \cos (θ) \cdot 2$

Apply pythagorean identity.

$1 = \cos (θ) \cdot 2$

Move $2$ to the left of $\cos (θ)$ .

$1 = 2 \cos (θ)$

Rewrite the equation as $2 \cos (θ) = 1$ .

$2 \cos (θ) = 1$

Divide each term in $2 \cos (θ) = 1$ by $2$ and simplify.

Divide each term in $2 \cos (θ) = 1$ by $2$ .

$\frac{2 \cos (θ)}{2} = \frac{1}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 \cos (θ)}{2} = \frac{1}{2}$

Divide $\cos (θ)$ by $1$ .

$\cos (θ) = \frac{1}{2}$

Take the inverse cosine of both sides of the equation to extract $θ$ from inside the cosine.

$θ = \arccos (\frac{1}{2})$

Simplify the right side.

The exact value of $\arccos (\frac{1}{2})$ is $\frac{π}{3}$ .

$θ = \frac{π}{3}$

The cosine function is positive in the first and fourth quadrants. To find the second solution, subtract the reference angle from $2 π$ to find the solution in the fourth quadrant.

$θ = 2 π - \frac{π}{3}$

Simplify $2 π - \frac{π}{3}$ .

To write $2 π$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$θ = 2 π \cdot \frac{3}{3} - \frac{π}{3}$

Combine fractions.

Combine $2 π$ and $\frac{3}{3}$ .

$θ = \frac{2 π \cdot 3}{3} - \frac{π}{3}$

Combine the numerators over the common denominator.

$θ = \frac{2 π \cdot 3 - π}{3}$

Simplify the numerator.

Multiply $3$ by $2$ .

$θ = \frac{6 π - π}{3}$

Subtract $π$ from $6 π$ .

$θ = \frac{5 π}{3}$

Find the period of $\cos (θ)$ .

The period of the function can be calculated using $\frac{2 π}{| b |}$ .

$\frac{2 π}{| b |}$

Replace $b$ with $1$ in the formula for period.

$\frac{2 π}{| 1 |}$

The absolute value is the distance between a number and zero. The distance between $0$ and $1$ is $1$ .

$\frac{2 π}{1}$

Divide $2 π$ by $1$ .

$2 π$

The period of the $\cos (θ)$ function is $2 π$ so values will repeat every $2 π$ radians in both directions.

$θ = \frac{π}{3} + 2 π n, \frac{5 π}{3} + 2 π n$ , for any integer $n$

Evaluate cos(theta)+sin(theta)*tan(theta)=2

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