Enter a problem...
Trigonometry Examples
Step 1
Take the inverse arccosine of both sides of the equation to extract from inside the arccosine.
Step 2
Step 2.1
Simplify .
Step 2.1.1
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant.
Step 2.1.2
The exact value of is .
Step 2.1.3
Multiply by .
Step 3
Step 3.1
Divide each term in by .
Step 3.2
Simplify the left side.
Step 3.2.1
Cancel the common factor of .
Step 3.2.1.1
Cancel the common factor.
Step 3.2.1.2
Divide by .
Step 3.3
Simplify the right side.
Step 3.3.1
Move the negative in front of the fraction.
Step 4
The result can be shown in multiple forms.
Exact Form:
Decimal Form: