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Trigonometry Examples
Step 1
Start on the left side.
Step 2
Step 2.1
To write as a fraction with a common denominator, multiply by .
Step 2.2
To write as a fraction with a common denominator, multiply by .
Step 2.3
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
Step 2.3.1
Multiply by .
Step 2.3.2
Multiply by .
Step 2.3.3
Reorder the factors of .
Step 2.4
Combine the numerators over the common denominator.
Step 3
Step 3.1
Simplify each term.
Step 3.1.1
Apply the distributive property.
Step 3.1.2
Multiply by .
Step 3.1.3
Apply the distributive property.
Step 3.1.4
Multiply by .
Step 3.2
Add and .
Step 3.3
Add and .
Step 3.3.1
Reorder and .
Step 3.3.2
Subtract from .
Step 3.4
Add and .
Step 4
Step 4.1
Expand using the FOIL Method.
Step 4.1.1
Apply the distributive property.
Step 4.1.2
Apply the distributive property.
Step 4.1.3
Apply the distributive property.
Step 4.2
Simplify and combine like terms.
Step 5
Apply pythagorean identity.
Step 6
Cancel the common factor of and .
Step 7
Rewrite as .
Step 8
Because the two sides have been shown to be equivalent, the equation is an identity.
is an identity