# Leser fragen: How Were Sine Values Calculated In Middle Ages?

## How did they calculate sin?

sin(α+β) = sin α cos β + sin β cos α. to bootstrap your way from known values to other values. Elementary geometry gives you the sines of 45° and 30°, and the sum-angle formula will then give you the sine of 75°. Then you can use the sum-angle formula to find the sine of 3° from the sines of 75° and 72°.

## How was sine and cosine discovered?

In the early 9th century AD, Muhammad ibn Mūsā al-Khwārizmī produced accurate sine and cosine tables, and the first table of tangents. He was also a pioneer in spherical trigonometry. For the second one, the text states: “We multiply the sine of each of the two arcs by the cosine of the other minutes.

## When was sine discovered?

Sine was introduced by Abu’l Wafa in 8th century, as a more convenient function, and gradually spread first in the Muslim world, and then to the West. (But apparently it was used in India centuries before him), as a more convenient function. However this new notation was adopted very slowly, it took centuries.

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## How did people do trig without calculators?

Once they measured all the angles, they measured (very accurately) one of the sides of one of the triangles in their mesh, then used trig to fill in all the distances. They did this all without a calculator.

## Why sine is called sine?

The word sine comes from the Latin sinus, bosom, because early translators mistook the Arabic word for chord and thought it was the Arabic word for bosom. The “co-” prefix in cosine and cotangent simply stands for co-angle, the complementary angle. The cosine of an angle is the sine of its complementary angle.

## Who is the father of mathematics?

Archimedes is known as the Father of Mathematics. Mathematics is one of the ancient sciences developed in time immemorial. A major topic of discussion regarding this particular field of science is about who is the father of mathematics.

## Who invented sin?

The doctrine of original sin began to emerge in the 3rd century but only became fully formed with the writings of Augustine of Hippo (354–430), who was the first author to use the phrase “original sin” (Latin: peccatum originale).

## Who invented math?

The earliest evidence of written mathematics dates back to the ancient Sumerians, who built the earliest civilization in Mesopotamia. They developed a complex system of metrology from 3000 BC.

## What is the value of sine?

As can be seen from the figure, sine has a value of 0 at 0° and a value of 1 at 90°. Cosine follows the opposite pattern; this is because sine and cosine are cofunctions (described later). The other commonly used angles are 30° ( ), 45° ( ), 60° ( ) and their respective multiples.

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## What is sin 45 degrees?

Sin 45 Degrees The value of Sin 45 degree in decimal form is 0.7071067812. Sine is considered as one of the most important functions in trigonometry as it is used to find out the unknown values of the angles and length of the sides of a right-angle triangle.

## How do you find the value of sin 75?

Hence the value of Sin 75 degree is equal to (√3 + 1) / 2√2.

## Who invented trigonometry?

Trigonometry in the modern sense began with the Greeks. Hipparchus (c. 190–120 bce) was the first to construct a table of values for a trigonometric function.

## What does a sine curve look like?

The shape of the sine curve is the same for each full rotation of the angle and so the function is called ‘periodic’. The period of the function is 360° or 2π radians. You can rotate the point as many times as you like. This means you can find the sine of any angle, no matter how large.

## What is sin equal to?

Always, always, the sine of an angle is equal to the opposite side divided by the hypotenuse (opp/hyp in the diagram). The cosine is equal to the adjacent side divided by the hypotenuse (adj/hyp). What is the sine of B in the diagram? Remember opp/hyp: the opposite side is b and the hypotenuse is c, so sin B = b/c.