Section 3.5-solutions-2

# Section 3.5-solutions-2 - to(aqt73 – Section 3.5 –...

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Unformatted text preview: to (aqt73) – Section 3.5 – isaacson – (55826) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Find the derivative of f ( x ) = 3 x sin2 x + 3 2 cos 2 x . 1. f ′ ( x ) =- 6 x cos 2 x 2. f ′ ( x ) = 6 x cos 2 x correct 3. f ′ ( x ) = 6 x cos 2 x- 6 sin 2 x 4. f ′ ( x ) = 6 x cos 2 x + 6 sin 2 x 5. f ′ ( x ) = 6 cos 2 x Explanation: Since d dx sin x = cos x, d dx cos x =- sin x, it follows that f ′ ( x ) = 3 sin2 x + 6 x cos2 x- 3 sin2 x. Consequently, f ′ ( x ) = 6 x cos2 x . 002 10.0 points Find f ′ ( x ) when f ( x ) = 1 √ x 2- 6 x . 1. f ′ ( x ) = x- 3 (6 x- x 2 ) 1 / 2 2. f ′ ( x ) = x- 3 ( x 2- 6 x ) 3 / 2 3. f ′ ( x ) = 3- x ( x 2- 6 x ) 3 / 2 correct 4. f ′ ( x ) = 3- x (6 x- x 2 ) 3 / 2 5. f ′ ( x ) = 3- x ( x 2- 6 x ) 1 / 2 6. f ′ ( x ) = x- 3 (6 x- x 2 ) 3 / 2 Explanation: By the Chain Rule, f ′ ( x ) =- 1 2( x 2- 6 x ) 3 / 2 (2...
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Section 3.5-solutions-2 - to(aqt73 – Section 3.5 –...

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