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Use double-angle identities to write each expression, using trigonometric functions of θ instead of 4 θ. cos 4θ
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4 votes
Use double-angle identities to write each expression, using trigonometric functions of θ instead of 4 θ.

cos 4θ

User Tokosh
by
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1 Answer

4 votes

Answer:

cos4θ=8cos^4θ−8cos^2θ+1

Explanation:

User Emre Akman
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