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Hiii pls helpfirst one use addition or subtraction formula 4TT sin ( 5 ) cos (35 ) - 105 ( 5 ) sin (25 T

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Hiii pls helpfirst one use addition or subtraction formula

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4TT sin ( 5 ) cos (35 ) - 105 ( 5 ) sin (25 T 9 sin 0 - 1 = 0 Use the Addition Formula for Cosine to prove the Double-Angle Formula for Cosine. cos(2x) = cos2(x) - sin2(x) Rewrite 2x as x + x, and use the Addition Formula for Cosine to simplify. cos(2x) = cos(x + x) = Cos(X) cos(x)

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