simplify the following expression:
tan(540+X)．sec(270+x)．sin(90+x)
中四一條amths題目..急
2007-11-19 2:24 am
回答 (2)
2007-11-19 2:33 am
✔ 最佳答案
tan(540+X)．sec(270+x)．sin(90+x) = 3602007-11-18 18:34:00 補充：
X = 27.6
2007-11-18 21:11:08 補充：
tan ( 540* x ) sec ( 270* x ) sin ( 90* x )= tan [ 360* ( 180* x ) ] sec [ 360* - ( 90* - x ) ] sin [ 180* - ( 90* - x ) ] = tan ( 180* x ) sec ( 90* - x ) sin ( 90* - x )= tan x csc x cos x = tan x cot x = 1
2007-11-19 2:46 am
so hard ! 5......,I think is x=27.6
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071118000051KK03729