- What is the formula for sine?
- Why Sine is called sine?
- What is the formula for cos?
- How do you find sin 120 without a calculator?
- How do you find sin 50 without a calculator?
- Who is father of trigonometry?
- How do you calculate sin manually?
- How was sine discovered?
- What is cos in math?
- What is COS equal to?
- Who invented sin?
- Who invented math?

## What is the formula for sine?

SohcahtoaSoh…Sine = Opposite / Hypotenuse…cah…Cosine = Adjacent / Hypotenuse…toaTangent = Opposite / Adjacent.

## 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.

## What is the formula for cos?

In any right triangle, the cosine of an angle is the length of the adjacent side (A) divided by the length of the hypotenuse (H). In a formula, it is written simply as ‘cos’. Often remembered as “CAH” – meaning Cosine is Adjacent over Hypotenuse. See SOH CAH TOA.

## How do you find sin 120 without a calculator?

Use the unit circle and the fact that on the unit circle, sin A = y, and cos A = x. By drawing the unit circle it should be clear that sin(120) = sin(60) . If you know that sin(60) = sqrt(3)/2, then sin(120) = sqrt(3)/2. Originally Answered: How do you find sin 120 without a calculator?

## How do you find sin 50 without a calculator?

Here’s how you you can find it without calculator. Draw a right angeled triangle with one angle equal to 50 degree and side of any measurment. Now ,measure the perpendicular and hypotenous and calculate their ratio. Thats all.

## Who is father of trigonometry?

HipparchusThe first trigonometric table was apparently compiled by Hipparchus, who is consequently now known as “the father of trigonometry”.

## How do you calculate sin manually?

For example, to find out sine 23, first convert 23 to radians by dividing it by 180 and then multiplying by π. We get 23/180 π = 0.401425727958696 ≈ 0.4014257.

## How was sine discovered?

The function sine can be traced to the jyā and koṭi-jyā functions used in Gupta period Indian astronomy (Aryabhatiya, Surya Siddhanta), via translation from Sanskrit to Arabic, and then from Arabic to Latin.

## What is cos in math?

more … In a right angled triangle, the cosine of an angle is: The length of the adjacent side divided by the length of the hypotenuse. The abbreviation is cos. cos(θ) = adjacent / hypotenuse.

## What is COS equal to?

The cosine is equal to the adjacent side divided by the hypotenuse (adj/hyp). (1) Memorize: sine = (opposite side) / hypotenuse. cosine = (adjacent side) / hypotenuse.

## Who invented sin?

Hipparchus of NicaeaThe first trigonometric table was apparently compiled by Hipparchus of Nicaea (180 – 125 BCE), who is now consequently known as “the father of trigonometry.” Hipparchus was the first to tabulate the corresponding values of arc and chord for a series of angles.

## Who invented math?

Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom, theorem, and proof.