# How to Calculate the Value of Sine,Cosine and Tangent Without a Calculator?

Annoyed with remembering the trigonometry tables? You can calculate it with just a ruler and a semi-circle ruler that shows angles.

http://www.wikihow.com/Calculate-the-Value-of-Sine%2CCosine-and-Tangent-Without-a-Calcu...

## How to Calculate Roots Without a Calculator?

There is a method for calculating roots that is somewhat similar to the process for doing long division. This algorithm was taught in school before the invention of the electronic calculator. The a...
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http://www.ehow.com/how_8326757_calculate-roots-calculator.html

## How to Calculate Tangent Ratio?

You can use the tangent ratio to calculate an unknown side of a right triangle if you know one angle other than the right angle and one side other than the hypotenuse, which is the longest side opp...
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http://www.ehow.com/how_8259628_calculate-tangent-ratio.html

## How to Calculate An Angle Tangent?

The tangent is used to determine the angle within a triangle by using the ratios of two sides. In right triangles, the three sides are the hypotenuse, the opposite side and the adjacent side. The h...
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http://www.ehow.com/how_8224699_calculate-angle-tangent.html

## How to Calculate a Horizontal Tangent Line?

A horizontal tangent line is located where the derivative is zero. This is because, by definition, the derivative gives the slope of the tangent line. Horizontal lines have a slope of zero. Therefo...
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http://www.ehow.com/how_8198765_calculate-horizontal-tangent-line.html