- What mode should my calculator be in for sin and cos?
- How do you find an angle with 3 sides?
- Why is sin 60 and sin 120 the same?
- How do you find sin 120 without a calculator?
- How does the calculator calculate sine?
- What is formula for sine?
- Why Sine is called sine?
- How do you find an angle using trigonometry?
- What is cos135?
- How do you convert sine to degrees?
- How do you find an angle with sin?
- What does a sine curve look like?
- What is the formula for cos?

## What mode should my calculator be in for sin and cos?

For graphing calculators, press “Mode.” If you are using degrees (generally, if you are in geometry), the calculator should be set to degrees or “deg.” If you are using radians (precalculus or trigonometry), it should be set to radians or “rad.” Press the “Cos” button, generally found in the middle of the calculator..

## How do you find an angle with 3 sides?

To solve an SSS triangle:use The Law of Cosines first to calculate one of the angles.then use The Law of Cosines again to find another angle.and finally use angles of a triangle add to 180° to find the last angle.

## Why is sin 60 and sin 120 the same?

As the value of sine function in the second quadrant takes the positive value, the value of sin 120 degrees should be a positive value. By looking at the diagram given above, the value of sin 60 is equal to the value of sin 120. It means that, sin 60 = sin 120 = √3/2.

## 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 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.

## What is formula for sine?

= 0.500. The sine function, along with cosine and tangent, is one of the three most common trigonometric functions. 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’:

## Why Sine is called sine?

In mathematics, the sine is a trigonometric function of an angle. … The word “sine” (Latin “sinus”) comes from a Latin mistranslation by Robert of Chester of the Arabic jiba, which is a transliteration of the Sanskrit word for half the chord, jya-ardha.

## How do you find an angle using trigonometry?

ExamplesStep 1 The two sides we know are Opposite (300) and Adjacent (400).Step 2 SOHCAHTOA tells us we must use Tangent.Step 3 Calculate Opposite/Adjacent = 300/400 = 0.75.Step 4 Find the angle from your calculator using tan-1

## What is cos135?

The exact value of cos(135°) is -√(2) / 2. To find this, we use the angle sum identity for cosine, which is as follows: cos(X + Y) = cos(X…

## How do you convert sine to degrees?

Enter the inverse trigonometric function of the trigonometric value you wish to convert to degrees. First press the 2ND key, then press the key for the trigonometric function at hand. For example, if you wish to convert the sine of . 5 into degrees, press 2ND and then press SIN.

## How do you find an angle with sin?

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.

## What does a sine curve look like?

The domain of the sine function As you drag the point A around notice that after a full rotation about B, the graph shape repeats. 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.

## 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….Cosine (cos) function – Trigonometry.✔Formulae✔Other sides✔Hypotenuse1 more row