# 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...

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## 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... Read More »
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... Read More »
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... Read More »
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... Read More »
http://www.ehow.com/how_8198765_calculate-horizontal-tangent-line.html

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