Trigonometry Examples

Expand Using Sum/Difference Formulas tan(105)
Step 1
First, split the angle into two angles where the values of the six trigonometric functions are known. In this case, can be split into .
Step 2
Use the sum formula for tangent to simplify the expression. The formula states that .
Step 3
Simplify the numerator.
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Step 3.1
The exact value of is .
Step 3.2
The exact value of is .
Step 4
Simplify the denominator.
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Step 4.1
The exact value of is .
Step 4.2
Multiply by .
Step 4.3
The exact value of is .
Step 4.4
Rewrite as .
Step 5
Multiply by .
Step 6
Combine fractions.
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Step 6.1
Multiply by .
Step 6.2
Expand the denominator using the FOIL method.
Step 6.3
Simplify.
Step 7
Simplify the numerator.
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Step 7.1
Raise to the power of .
Step 7.2
Raise to the power of .
Step 7.3
Use the power rule to combine exponents.
Step 7.4
Add and .
Step 8
Rewrite as .
Step 9
Expand using the FOIL Method.
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Step 9.1
Apply the distributive property.
Step 9.2
Apply the distributive property.
Step 9.3
Apply the distributive property.
Step 10
Simplify and combine like terms.
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Step 10.1
Simplify each term.
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Step 10.1.1
Multiply by .
Step 10.1.2
Multiply by .
Step 10.1.3
Multiply by .
Step 10.1.4
Combine using the product rule for radicals.
Step 10.1.5
Multiply by .
Step 10.1.6
Rewrite as .
Step 10.1.7
Pull terms out from under the radical, assuming positive real numbers.
Step 10.2
Add and .
Step 10.3
Add and .
Step 11
Cancel the common factor of and .
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Step 11.1
Factor out of .
Step 11.2
Factor out of .
Step 11.3
Factor out of .
Step 11.4
Move the negative one from the denominator of .
Step 12
Rewrite as .
Step 13
Apply the distributive property.
Step 14
Multiply by .
Step 15
The result can be shown in multiple forms.
Exact Form:
Decimal Form: