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

Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Simplify each term.

Multiply by .

Multiply by .

Multiply by .

Multiply .

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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