Trigonometry Examples

$\frac{1 + \sin^{2} (x + y)}{2 + | x - \frac{2 x}{1 + x^{2} y^{2}} |}$

Step 1

To write $x$ as a fraction with a common denominator, multiply by $\frac{1 + x^{2} y^{2}}{1 + x^{2} y^{2}}$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (1 + x^{2} y^{2})}{1 + x^{2} y^{2}} - \frac{2 x}{1 + x^{2} y^{2}} |}$

Step 2

Combine the numerators over the common denominator.

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (1 + x^{2} y^{2}) - 2 x}{1 + x^{2} y^{2}} |}$

Step 3

Simplify the numerator.

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Step 3.1

Factor $x$ out of $x (1 + x^{2} y^{2}) - 2 x$ .

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Step 3.1.1

Factor $x$ out of $- 2 x$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (1 + x^{2} y^{2}) + x \cdot - 2}{1 + x^{2} y^{2}} |}$

Step 3.1.2

Factor $x$ out of $x (1 + x^{2} y^{2}) + x \cdot - 2$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (1 + x^{2} y^{2} - 2)}{1 + x^{2} y^{2}} |}$

Step 3.2

Subtract $2$ from $1$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (x^{2} y^{2} - 1)}{1 + x^{2} y^{2}} |}$

Step 3.3

Rewrite $x^{2} y^{2}$ as ${(x y)}^{2}$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x ({(x y)}^{2} - 1)}{1 + x^{2} y^{2}} |}$

Step 3.4

Rewrite $1$ as $1^{2}$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x ({(x y)}^{2} - 1^{2})}{1 + x^{2} y^{2}} |}$

Step 3.5

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x y$ and $b = 1$ .

$\frac{1 + \sin^{2} (x + y)}{2 + | \frac{x (x y + 1) (x y - 1)}{1 + x^{2} y^{2}} |}$