Trigonometry Examples

Find the Exact Value -4cot(-405)
Step 1
Add full rotations of ° until the angle is between ° and °.
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 fourth quadrant.
Step 3
The exact value of is .
Step 4
Multiply .
Tap for more steps...
Step 4.1
Multiply by .
Step 4.2
Multiply by .