A fence 9 feet tall runs parallel to a tall building at a distance of 3 ft from the building as shown in the diagram. Find the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. LADDER 9 ft 3 ft a) First, find a formula for the length of the ladder in terms of 0. (Hint: split the ladder into 2 parts.) 9 cos 0 + 3 sin 0 L(0) o [use function notation - use cos(theta) instead of costheta]. sin 0 cos 0 b) Now, find the derivative, L'(0). -2 cos (20)(3 sin(0) + 9 cos 0) + sin(20) (3 cos(0) – 9 sin(0))) 2 cos (0) sin (0) L'(0) = [use function notation - use cos(theta) instead of costheta]. c) Lastly, find the length of the shortest ladder. In other words, minimize the length of the ladder. (Round the answer to 3 decimal places.) L(0min ) - feet

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 41E
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A fence 9 feet tall runs parallel to a tall building at a distance of 3 ft from the building as shown in
the diagram. Find the length of the shortest ladder that will reach from the ground over the fence to
the wall of the building.
LADDER
9 ft
3 ft
a) First, find a formula for the length of the ladder in terms of 0. (Hint: split the ladder into 2 parts.)
L(0) =
9 cos 0 + 3 sin 0
sin 0 cos 0
o [use function notation - use cos(theta) instead of costheta].
b) Now, find the derivative, L'(0).
-2 cos (20) (3 sin(0) + 9 cos 0) + sin(20) (3 cos (0) – 9 sin(0)))
L'(0)
[use function
2
2 cos“ (0) sin (0)
notation - use cos(theta) instead of costheta].
c) Lastly, find the length of the shortest ladder. In other words, minimize the length of the ladder.
(Round the answer to 3 decimal places.)
L(0min )
feet
Transcribed Image Text:A fence 9 feet tall runs parallel to a tall building at a distance of 3 ft from the building as shown in the diagram. Find the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. LADDER 9 ft 3 ft a) First, find a formula for the length of the ladder in terms of 0. (Hint: split the ladder into 2 parts.) L(0) = 9 cos 0 + 3 sin 0 sin 0 cos 0 o [use function notation - use cos(theta) instead of costheta]. b) Now, find the derivative, L'(0). -2 cos (20) (3 sin(0) + 9 cos 0) + sin(20) (3 cos (0) – 9 sin(0))) L'(0) [use function 2 2 cos“ (0) sin (0) notation - use cos(theta) instead of costheta]. c) Lastly, find the length of the shortest ladder. In other words, minimize the length of the ladder. (Round the answer to 3 decimal places.) L(0min ) feet
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