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Simplify (1-cos(x))(1+cos(x))

Simplify (1-cos(x))(1+cos(x))
Expand using the FOIL Method.
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Apply the distributive property.
Apply the distributive property.
Apply the distributive property.
Simplify and combine like terms.
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Simplify each term.
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Multiply by .
Multiply by .
Multiply by .
Multiply .
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Raise to the power of .
Raise to the power of .
Use the power rule to combine exponents.
Add and .
Subtract from .
Add and .
Apply pythagorean identity.
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