Application of differentiation

👨🏻‍🏫 學術台數學

知識就是力量

2011-03-22 2:44 am

As follows:

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更新1:

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更新2:

Ignore the stupid question I ask...=.="

更新3:

Sorry for one more disturbance =.=" Can you explain more why dy/dθ <= 0 when you find dy/dθ = 200sqrt3 sec^2 θ(sin θ - 1)

回答 (2)

用戶9112

2011-03-22 5:25 am

✔ 最佳答案

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2011-03-21 21:51:24 補充：
secant square must be +ve
sine is always less than 1, so sine - 1 is less than or equal to 0

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知識就是力量

2011-03-22 7:16 am

One more question to ask, why do you say y decreases monotonically with θ? Do you mean there is a max. value of y at dy/dθ = 0 but the y will keep decreasing when dy/dθ < 0? And how does it relate to find max θ for CP = CA?

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