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Inequalities and Absolute Values

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Linear Inequality

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An inequality involving a linear expression in one variable without exponents, such as 3x1>23x - 1 > 2.

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Polynomial Inequality

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An inequality containing a polynomial, such as x24x+3<0x^2 - 4x + 3 < 0.

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Absolute Value Inequality

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An inequality involving the absolute value, such as 2x+1>3|2x + 1| > 3. It requires considering both the positive and negative scenarios of the expression inside the absolute value.

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Rational Inequality

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An inequality containing a ratio of polynomials, such as x1x+20\frac{x-1}{x+2} \leq 0. Critical points from the numerator and denominator are used to find the solution set.

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System of Linear Inequalities

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A set of two or more linear inequalities in the same variables, such as {y>2x+1yx+3\begin{cases} y > 2x + 1 \\ y \leq -x + 3 \end{cases}.

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Quadratic Inequality

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An inequality involving a quadratic expression, for example, x2x6>0x^2 - x - 6 > 0.

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Triangle Inequality

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A fundamental inequality in geometry stating that for any triangle, the sum of the lengths of any two sides must be greater than the length of the remaining side, such as a+b>ca + b > c for the sides of a triangle.

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Compound Inequality

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An inequality that combines two or more simple inequalities using the words 'and' or 'or', for example, 3<x+1<53 < x + 1 < 5 means xx can take on values between 22 and 44.

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Exponential Inequality

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An inequality containing an exponential function, such as 2x<82^x < 8.

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Logarithmic Inequality

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An inequality involving logarithmic functions, like log(x)>1\log(x) > 1.

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Elliptic Inequality

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An inequality akin to the equation of an ellipse but with an inequality sign. For example, x2a2+y2b2<1\frac{x^2}{a^2} + \frac{y^2}{b^2} < 1 represents the points inside an ellipse.

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Trigonometric Inequality

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An inequality involving trigonometric functions, such as sinx>0.5\sin x > 0.5.

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Hyperbolic Inequality

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An inequality related to hyperbolas, similar to a hyperbolic equation, for example, x2a2y2b2>1\frac{x^2}{a^2} - \frac{y^2}{b^2} > 1, which indicates the region outside the hyperbola.

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Piecewise Inequality

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An inequality defined by different expressions depending on the interval the variable lies in, such as f(x)={x2,x0x,x>0f(x) = \begin{cases} x^2, & x \leq 0 \\ -x, & x > 0 \end{cases}, then solving for f(x)<1f(x) < 1.

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Nonlinear System of Inequalities

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A combination of inequalities that can involve linear, quadratic, rational, or other nonlinear entities, such as {y>x2+1xy<3\begin{cases} y > x^2 + 1 \\ x - y < 3 \end{cases}.

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