Trigonometry Examples

${(- \frac{\sqrt{7}}{4})}^{2} - {(\frac{3}{4})}^{2}$

Step 1

Simplify each term.

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Step 1.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 1.1.1

Apply the product rule to $- \frac{\sqrt{7}}{4}$ .

${(- 1)}^{2} {(\frac{\sqrt{7}}{4})}^{2} - {(\frac{3}{4})}^{2}$

Step 1.1.2

Apply the product rule to $\frac{\sqrt{7}}{4}$ .

${(- 1)}^{2} \frac{{\sqrt{7}}^{2}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.2

Raise $- 1$ to the power of $2$ .

$1 \frac{{\sqrt{7}}^{2}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.3

Multiply $\frac{{\sqrt{7}}^{2}}{4^{2}}$ by $1$ .

$\frac{{\sqrt{7}}^{2}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4

Rewrite ${\sqrt{7}}^{2}$ as $7$ .

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Step 1.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{7}$ as $7^{\frac{1}{2}}$ .

$\frac{{(7^{\frac{1}{2}})}^{2}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4.2

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

$\frac{7^{\frac{1}{2} \cdot 2}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4.3

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

$\frac{7^{\frac{2}{2}}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4.4

Cancel the common factor of $2$ .

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Step 1.4.4.1

Cancel the common factor.

$\frac{7^{\frac{2}{2}}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4.4.2

Rewrite the expression.

$\frac{7^{1}}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.4.5

Evaluate the exponent.

$\frac{7}{4^{2}} - {(\frac{3}{4})}^{2}$

Step 1.5

Raise $4$ to the power of $2$ .

$\frac{7}{16} - {(\frac{3}{4})}^{2}$

Step 1.6

Apply the product rule to $\frac{3}{4}$ .

$\frac{7}{16} - \frac{3^{2}}{4^{2}}$

Step 1.7

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

$\frac{7}{16} - \frac{9}{4^{2}}$

Step 1.8

Raise $4$ to the power of $2$ .

$\frac{7}{16} - \frac{9}{16}$

Step 2

Simplify terms.

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Step 2.1

Combine the numerators over the common denominator.

$\frac{7 - 9}{16}$

Step 2.2

Subtract $9$ from $7$ .

$\frac{- 2}{16}$

Step 2.3

Cancel the common factor of $- 2$ and $16$ .

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Step 2.3.1

Factor $2$ out of $- 2$ .

$\frac{2 (- 1)}{16}$

Step 2.3.2

Cancel the common factors.

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Step 2.3.2.1

Factor $2$ out of $16$ .

$\frac{2 \cdot - 1}{2 \cdot 8}$

Step 2.3.2.2

Cancel the common factor.

$\frac{2 \cdot - 1}{2 \cdot 8}$

Step 2.3.2.3

Rewrite the expression.

$\frac{- 1}{8}$

Step 2.4

Move the negative in front of the fraction.

$- \frac{1}{8}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$- \frac{1}{8}$

Decimal Form:

$- 0.125$