Q:
# What is sin 90 degrees?

**Sin 90 degrees is equal to one.** This degree value can also be expressed in radians as sin(?/2) = 1. This value of the sine function corresponds to one-fourth of the complete arc distance along the unit circle.

Radians are a unit of angular measurement that describe an angle in terms of the length of a corresponding arc on the unit circle. Radians are found using the length of the arc divided by the radius of the arc. There are 360 degrees in a complete unit circle, which is equal to 2? radians. This means that 90 degrees is equal to ?/2 radians and this gives sin(?/2) a value of 1.

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Q:
## What is arctan(x) in math?

A: The function arctan(x) describes the inverse tangent of x, wherein the ratio between the length of the sides opposite and adjacent to the angle can be used... Full Answer >Filed Under: -
Q:
## How do you convert radians to degrees?

A: Radians and degrees are both units for measuring angles with respect to a circle. Convert radians to degrees by multiplying the number of radians by 180 an... Full Answer >Filed Under: -
Q:
## What is arctan(2)?

A: The arc tangent (arctan) of 2 degrees is 63.43, while the arctan of 2 radians is 1.107. The function arctan(2) can also be described as the inverse tangent... Full Answer >Filed Under: -
Q:
## What is cos 0 degrees equal to?

A: The cosine of zero degrees is equal to one. The cosine is a trigonometric function that can be defined through the Pythagorean Theorem as the length of the... Full Answer >Filed Under: