Precalculus Examples

$10 = \frac{1}{2} \cdot ((4) (5 \sqrt{2}) \sin (x))$

Step 1

Rewrite the equation as $\frac{1}{2} \cdot 4 \cdot (5 \sqrt{2} \sin (x)) = 10$ .

$\frac{1}{2} \cdot 4 \cdot (5 \sqrt{2} \sin (x)) = 10$

Step 2

Simplify.

Tap for more steps...

Step 2.1

Cancel the common factor of $2$ .

Tap for more steps...

Step 2.1.1

Factor $2$ out of $4$ .

$\frac{1}{2} \cdot (2 (2)) \cdot (5 \sqrt{2} \sin (x)) = 10$

Step 2.1.2

Cancel the common factor.

$\frac{1}{2} \cdot (2 \cdot 2) \cdot (5 \sqrt{2} \sin (x)) = 10$

Step 2.1.3

Rewrite the expression.

$2 \cdot (5 \sqrt{2} \sin (x)) = 10$

Step 2.2

Multiply $5$ by $2$ .

$10 \cdot (\sqrt{2} \sin (x)) = 10$

Step 2.3

Remove parentheses.

$10 \cdot \sqrt{2} \sin (x) = 10$

Step 3

Divide each term in $10 \cdot (\sqrt{2} \sin (x)) = 10$ by $10 \sqrt{2}$ and simplify.

Tap for more steps...

Step 3.1

Divide each term in $10 \cdot (\sqrt{2} \sin (x)) = 10$ by $10 \sqrt{2}$ .

$\frac{10 \cdot (\sqrt{2} \sin (x))}{10 \sqrt{2}} = \frac{10}{10 \sqrt{2}}$

Step 3.2

Simplify the left side.

Tap for more steps...

Step 3.2.1

Cancel the common factor of $10$ .

Tap for more steps...

Step 3.2.1.1

Cancel the common factor.

$\frac{10 \cdot (\sqrt{2} \sin (x))}{10 \sqrt{2}} = \frac{10}{10 \sqrt{2}}$

Step 3.2.1.2

Rewrite the expression.

$\frac{\sqrt{2} \sin (x)}{\sqrt{2}} = \frac{10}{10 \sqrt{2}}$

Step 3.2.2

Cancel the common factor of $\sqrt{2}$ .

Tap for more steps...

Step 3.2.2.1

Cancel the common factor.

$\frac{\sqrt{2} \sin (x)}{\sqrt{2}} = \frac{10}{10 \sqrt{2}}$

Step 3.2.2.2

Divide $\sin (x)$ by $1$ .

$\sin (x) = \frac{10}{10 \sqrt{2}}$

Step 3.3

Simplify the right side.

Tap for more steps...

Step 3.3.1

Cancel the common factor of $10$ .

Tap for more steps...

Step 3.3.1.1

Cancel the common factor.

$\sin (x) = \frac{10}{10 \sqrt{2}}$

Step 3.3.1.2

Rewrite the expression.

$\sin (x) = \frac{1}{\sqrt{2}}$

Step 3.3.2

Multiply $\frac{1}{\sqrt{2}}$ by $\frac{\sqrt{2}}{\sqrt{2}}$ .

$\sin (x) = \frac{1}{\sqrt{2}} \cdot \frac{\sqrt{2}}{\sqrt{2}}$

Step 3.3.3

Combine and simplify the denominator.

Tap for more steps...

Step 3.3.3.1

Multiply $\frac{1}{\sqrt{2}}$ by $\frac{\sqrt{2}}{\sqrt{2}}$ .

$\sin (x) = \frac{\sqrt{2}}{\sqrt{2} \sqrt{2}}$

Step 3.3.3.2

Raise $\sqrt{2}$ to the power of $1$ .

$\sin (x) = \frac{\sqrt{2}}{{\sqrt{2}}^{1} \sqrt{2}}$

Step 3.3.3.3

Raise $\sqrt{2}$ to the power of $1$ .

$\sin (x) = \frac{\sqrt{2}}{{\sqrt{2}}^{1} {\sqrt{2}}^{1}}$

Step 3.3.3.4

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

$\sin (x) = \frac{\sqrt{2}}{{\sqrt{2}}^{1 + 1}}$

Step 3.3.3.5

Add $1$ and $1$ .

$\sin (x) = \frac{\sqrt{2}}{{\sqrt{2}}^{2}}$

Step 3.3.3.6

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

Tap for more steps...

Step 3.3.3.6.1

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

$\sin (x) = \frac{\sqrt{2}}{{(2^{\frac{1}{2}})}^{2}}$

Step 3.3.3.6.2

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

$\sin (x) = \frac{\sqrt{2}}{2^{\frac{1}{2} \cdot 2}}$

Step 3.3.3.6.3

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

$\sin (x) = \frac{\sqrt{2}}{2^{\frac{2}{2}}}$

Step 3.3.3.6.4

Cancel the common factor of $2$ .

Tap for more steps...

Step 3.3.3.6.4.1

Cancel the common factor.

$\sin (x) = \frac{\sqrt{2}}{2^{\frac{2}{2}}}$

Step 3.3.3.6.4.2

Rewrite the expression.

$\sin (x) = \frac{\sqrt{2}}{2^{1}}$

Step 3.3.3.6.5

Evaluate the exponent.

$\sin (x) = \frac{\sqrt{2}}{2}$

Step 4

Take the inverse sine of both sides of the equation to extract $x$ from inside the sine.

$x = \arcsin (\frac{\sqrt{2}}{2})$

Step 5

Simplify the right side.

Tap for more steps...

Step 5.1

The exact value of $\arcsin (\frac{\sqrt{2}}{2})$ is $\frac{π}{4}$ .

$x = \frac{π}{4}$

Step 6

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

$x = π - \frac{π}{4}$

Step 7

Simplify $π - \frac{π}{4}$ .

Tap for more steps...

Step 7.1

To write $π$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$x = π \cdot \frac{4}{4} - \frac{π}{4}$

Step 7.2

Combine fractions.

Tap for more steps...

Step 7.2.1

Combine $π$ and $\frac{4}{4}$ .

$x = \frac{π \cdot 4}{4} - \frac{π}{4}$

Step 7.2.2

Combine the numerators over the common denominator.

$x = \frac{π \cdot 4 - π}{4}$

Step 7.3

Simplify the numerator.

Tap for more steps...

Step 7.3.1

Move $4$ to the left of $π$ .

$x = \frac{4 \cdot π - π}{4}$

Step 7.3.2

Subtract $π$ from $4 π$ .

$x = \frac{3 π}{4}$

Step 8

Find the period of $\sin (x)$ .

Tap for more steps...

Step 8.1

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

$\frac{2 π}{| b |}$

Step 8.2

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

$\frac{2 π}{| 1 |}$

Step 8.3

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

$\frac{2 π}{1}$

Step 8.4

Divide $2 π$ by $1$ .

$2 π$

Step 9

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

$x = \frac{π}{4} + 2 π n, \frac{3 π}{4} + 2 π n$ , for any integer $n$