## 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..

## What is the sine of a 30 angle?

The value of sin 30 degrees is 0.5. Sin 30 is also written as sin π/6, in radians. The trigonometric function also called as an angle function relates the angles of a triangle to the length of its sides.

## What does Sine mean?

In mathematics, the sine is a trigonometric function of an angle. The sine of an acute angle is defined in the context of a right triangle: for the specified angle, it is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse).

## How do you find COS 180 degrees?

To find the value of cos 180 degrees from the Cartesian plane, the value 180 degree takes place in the second quadrant. As the cosine values in the second quadrant always take a negative value. From the value of cos 0, we will obtain the value of cos 180°. It is also represented in terms of radians.

## 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?

## What is the formula for sine?

In any right triangle, the sine of an angle x is the length of the opposite side (O) divided by the length of the hypotenuse (H). In a formula, it is written as ‘sin’ without the ‘e’: Often remembered as “SOH” – meaning Sine is Opposite over Hypotenuse.

## How does the calculator calculate sine?

A calculator or computer program is not reading off of a list, but is using an algorithm that gives an approximate value for the sine of a given angle. … 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 do you find the sine of an angle?

On your calculator, input the value of either your sine or your cosine. Then press “inv.” This should give you the angle associated with that value. The angle associated with sin 0.923 or cos 0.384 is 67.38 degrees. Add 90 to the angle you just calculated, and subtract the sum from 180.