Write the x value in the unit circle in terms of theta the measure of the central angle

  x = cos(θ)

Step-by-step explanation:

The above relation is one that is usefully committed to memory. The mnemonic SOH CAH TOA can help you remember it, along with ...

  y = sin(θ)

The x-value is adjacent to the central angle; the y-value is opposite. The hypotenuse of the relevant triangle in a unit circle is 1.

The x-value is ...

  x = cos(θ)

These relationships are necessary to convert from rectangular to polar coordinates and vice versa. They are also helpful when working vector problems.

cosine

step-by-step explanation:

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b