$\"\"$

The given angle is $\"\"$ 90^o.

To find a point on the terminal side of $\"\"$ 90^o.

The terminal side of $\"\"$ 90^o lies along the negative y-axis.

A convenient point on the terminal side of $\"\"$ 90^o is (0, $\"\"$ 1).

The distance formula from the origin to (x, y): $\"\"$ .

$\"\"$ (Substitute x = 0, y = $\"\"$ 1)

$\"\"$ $\"\"$

The trigonometric functions using the values x = 0, y = $\"\"$ 1 and $\"\"$ .

$\"\"$ (Substitute $\"\"$ , y = $\"\"$ 1)

$\"\"$ (Substitute $\"\"$ , x = 0)

$\"\"$ (Substitute x = 0, y = $\"\"$ 1) $\"\"$

To graph the angle $\"\"$ 90^o.

$\"graph$

$\"\"$

The trigonometric values are $\"\"$ , $\"\"$ , $\"\"$ .

To graph the angle $\"\"$ 90^o.

$\"graph$