Simplify cos(2theta)^2-sin(2theta)^2

Math
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Expand using the FOIL Method.
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Apply the distributive property.
Apply the distributive property.
Apply the distributive property.
Simplify terms.
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Combine the opposite terms in .
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Reorder the factors in the terms and .
Add and .
Add and .
Simplify each term.
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Multiply .
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Raise to the power of .
Raise to the power of .
Use the power rule to combine exponents.
Add and .
Rewrite using the commutative property of multiplication.
Multiply .
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Raise to the power of .
Raise to the power of .
Use the power rule to combine exponents.
Add and .
Apply the cosine doubleangle identity.
Multiply by .
Simplify cos(2theta)^2-sin(2theta)^2

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