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Trigonometry Examples
Step 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
The exact value of is .
Step 3
Step 3.1
Multiply by .
Step 3.2
Multiply by .
Step 4
Step 4.1
Write as a fraction with a common denominator.
Step 4.2
Combine the numerators over the common denominator.
Step 5
Multiply the numerator by the reciprocal of the denominator.
Step 6
Step 6.1
Multiply by .
Step 6.2
Multiply by .
Step 7
Rewrite as .
Step 8
Step 8.1
Rewrite as .
Step 8.2
Pull terms out from under the radical, assuming positive real numbers.
Step 9
The result can be shown in multiple forms.
Exact Form:
Decimal Form: