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Simplify the expression by using a double-angle formula. cos²40-sin²40
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Simplify the expression by using a double-angle formula.
cos²40-sin²40

User Utsav Dawn
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1 Answer

6 votes

Answer:
\cos 80^(\circ)

Explanation:

Use the cosine double angle identity.

Simplify the expression by using a double-angle formula. cos²40-sin²40-example-1
User InTry
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