(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

there's a picture of the question... from my text book

http://photos-h.ak.fbcdn.net/hphotos..._1385551_n.jpg [Broken]

thers a diagram image of the problem too to help understand

2. Relevant equations

well its a word problem,

i used cosine rule at beginining and then pythagoras...i dont know what to do next but i think you calculare the area and then derivative. but i dont know how (whats the equation for the area)

3. The attempt at a solution

well i used the cosine rule for triangle BCO

BC^2 = 10^2 + 10^2 - 2x10x10 cosθ

BC = √(200-200cosθ)

XY = BC

BY^2 = BX^2 + XY^2 =

400 = BX^2 + (200-200cosθ)

BX^2 = 200 + 200cosθ

BX = √(200+200cosθ)

now what do i do?

reply asap ! :P thankss !!

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# Homework Help: HELP optimization derivative of trig functions, grade 11 math,give it a try please !

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