各位打擾囉,我作習題時解到這兩題應用問題,不過
光是題目就有點搞不太懂它在幹嘛,想請板上神手幫個
忙,這兩題是課本裡反三角函數那節的習題,拜託大家囉!
如果可以有圖解,那就真的感謝萬分了>//<
1. A biilboard k feet wide is perpendicular to a
straight road and is s feet from the road. From
what point on the road would a motorist have the
best view of the billboard; that is, at what point
on the road is the angle θ subtended by the
billboard a maximum?
課本給的簡圖 http://ppt.cc/dZI~
2. A person walking along a straight path at the rate
of 6 feet per second is followed by a spotlight that
is located 30 feet from the path. How fast is the
spotlight turning at the instant the person is 50 feet
past the point on the path that is closest to the
spotlight? (這題沒有圖,不懂要問什麼?)
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