Blogs about: Trigonometry
特色網誌
溫書題
這是溫書時期。 1. 有關數列的題目 這是校內 2007-2008 年度純數期終試其中一題： ======================================= Let {} be a sequence of positive integers. Define sequences {} and {} as . () . () Let . () Show that . =========… more →
Quod Erat Demonstrandum
溫書題
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wrote 7 months ago: 這是溫書時期。 1. 有關數列的題目 這是校內 2007-2008 年度純數期終試其中一題： ======================================= Let {} be a s … more →
Some F.4 textbook questions
wrote 10 months ago: Students may find the following textbook questions difficult. Question 1 Refer to the figure below, … more →
Just an old question about F.4 trigonometry
wrote 10 months ago: It is glad that F.4 students asked me how to evaluate Here is a way. Knowing that Hence the required … more →
錯在哪裡系列：零是不定義？
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wrote 12 months ago: When giving the following basic trigonometry question in F.4 additional mathematics lesson: Given , … more →
做數雕蟲小技系列：看整體
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wrote 1 year ago: 看整體有時比看局部好。舉例 1. Factorize . 部分同學把焦點集中在 和 這兩個部分，他們會採取「爆破」的策略，把 和 分別爆開，即 和 。但如果看整體，即 其實已是 這個形式（其中 ），那 … more →
正割餘割
wrote 1 year ago: 中四開新課，同學認識一下新「朋友」吧： 正弦 = sine () 餘弦 = cosine () 正切 = tangent () 餘割 = cosecant () 定義： 正割 = secant () … more →
