果種要簡化sin cos tan式既題目我成日都唔太識.....
即係我唔知一題式入面要轉邊d位 (eg. tan -> sin/cos or sin -> tancos) 先可以去到d可以進行簡化既step (eg. sin2+cos2 (=1) )
點先可以一睇條式就知要轉邊d位遲d就可以進行簡化? 唔該晒!!
關於sin cos tan既題目..
2009-04-14 10:33 pm
回答 (1)
2009-04-15 2:19 am
✔ 最佳答案
Some basic guidelines :1. Change tan x to sin x and cos x.(tan x = sin x/cos x).
2. Express with a common denominator. [ e.g. 1/sin x + 1/cos x = (sin x + cos x)/sin x cos x.]
3. Make good use of the relation sin^2 x + cos ^2 x = 1 to simplify the expression.
4. If ever possible, factorize the expression to see if any elimination can be done.
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