Trigonometry Examples

$16 \sin (75)$

Step 1

The exact value of $\sin (75)$ is $\frac{\sqrt{2} + \sqrt{6}}{4}$ .

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Step 1.1

Split $75$ into two angles where the values of the six trigonometric functions are known.

$16 \sin (30 + 45)$

Step 1.2

Apply the sum of angles identity.

$16 (\sin (30) \cos (45) + \cos (30) \sin (45))$

Step 1.3

The exact value of $\sin (30)$ is $\frac{1}{2}$ .

$16 (\frac{1}{2} \cos (45) + \cos (30) \sin (45))$

Step 1.4

The exact value of $\cos (45)$ is $\frac{\sqrt{2}}{2}$ .

$16 (\frac{1}{2} \cdot \frac{\sqrt{2}}{2} + \cos (30) \sin (45))$

Step 1.5

The exact value of $\cos (30)$ is $\frac{\sqrt{3}}{2}$ .

$16 (\frac{1}{2} \cdot \frac{\sqrt{2}}{2} + \frac{\sqrt{3}}{2} \sin (45))$

Step 1.6

The exact value of $\sin (45)$ is $\frac{\sqrt{2}}{2}$ .

$16 (\frac{1}{2} \cdot \frac{\sqrt{2}}{2} + \frac{\sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2})$

Step 1.7

Simplify $\frac{1}{2} \cdot \frac{\sqrt{2}}{2} + \frac{\sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2}$ .

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Step 1.7.1

Simplify each term.

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Step 1.7.1.1

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

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Step 1.7.1.1.1

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

$16 (\frac{\sqrt{2}}{2 \cdot 2} + \frac{\sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2})$

Step 1.7.1.1.2

Multiply $2$ by $2$ .

$16 (\frac{\sqrt{2}}{4} + \frac{\sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2})$

Step 1.7.1.2

Multiply $\frac{\sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2}$ .

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Step 1.7.1.2.1

Multiply $\frac{\sqrt{3}}{2}$ by $\frac{\sqrt{2}}{2}$ .

$16 (\frac{\sqrt{2}}{4} + \frac{\sqrt{3} \sqrt{2}}{2 \cdot 2})$

Step 1.7.1.2.2

Combine using the product rule for radicals.

$16 (\frac{\sqrt{2}}{4} + \frac{\sqrt{3 \cdot 2}}{2 \cdot 2})$

Step 1.7.1.2.3

Multiply $3$ by $2$ .

$16 (\frac{\sqrt{2}}{4} + \frac{\sqrt{6}}{2 \cdot 2})$

Step 1.7.1.2.4

Multiply $2$ by $2$ .

$16 (\frac{\sqrt{2}}{4} + \frac{\sqrt{6}}{4})$

Step 1.7.2

Combine the numerators over the common denominator.

$16 \frac{\sqrt{2} + \sqrt{6}}{4}$

Step 2

Cancel the common factor of $4$ .

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Step 2.1

Factor $4$ out of $16$ .

$4 (4) \frac{\sqrt{2} + \sqrt{6}}{4}$

Step 2.2

Cancel the common factor.

$4 \cdot 4 \frac{\sqrt{2} + \sqrt{6}}{4}$

Step 2.3

Rewrite the expression.

$4 (\sqrt{2} + \sqrt{6})$

Step 3

Apply the distributive property.

$4 \sqrt{2} + 4 \sqrt{6}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$4 \sqrt{2} + 4 \sqrt{6}$

Decimal Form:

$15.45481322 \dots$