Trigonometry Examples

Find the Exact Value cot(-(13pi)/4)
Step 1
Add full rotations of until the angle is greater than or equal to and less than .
Step 2
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cotangent is negative in the second quadrant.
Step 3
The exact value of is .
Step 4
Multiply by .