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Trigonometry Examples
Step 1
Step 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 third quadrant.
Step 1.2
The exact value of is .
Step 1.3
Multiply by .
Step 1.4
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant.
Step 1.5
The exact value of is .
Step 1.6
Multiply by .
Step 1.7
Move to the left of .
Step 1.8
Rewrite as .
Step 2
Step 2.1
Subtract from .
Step 2.2
Multiply by .