Trigonometry Examples

Simplify sin(pi/3)cos((2pi)/3)-cos(pi/3)sin((2pi)/3)
Step 1
Simplify each term.
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Step 1.1
The exact value of is .
Step 1.2
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 1.3
The exact value of is .
Step 1.4
Multiply .
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Step 1.4.1
Multiply by .
Step 1.4.2
Multiply by .
Step 1.5
The exact value of is .
Step 1.6
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.
Step 1.7
The exact value of is .
Step 1.8
Multiply .
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Step 1.8.1
Multiply by .
Step 1.8.2
Multiply by .
Step 2
Simplify terms.
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Step 2.1
Combine the numerators over the common denominator.
Step 2.2
Subtract from .
Step 2.3
Cancel the common factor of and .
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Step 2.3.1
Factor out of .
Step 2.3.2
Cancel the common factors.
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Step 2.3.2.1
Factor out of .
Step 2.3.2.2
Cancel the common factor.
Step 2.3.2.3
Rewrite the expression.
Step 2.4
Move the negative in front of the fraction.
Step 3
The result can be shown in multiple forms.
Exact Form:
Decimal Form: