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(本小题满分12分) 已知向量,且 (Ⅰ)求tanA的值; (Ⅱ)求函数R)的值...

(本小题满分12分)

已知向量6ec8aac122bd4f6e,且6ec8aac122bd4f6e

(Ⅰ)求tanA的值;

(Ⅱ)求函数6ec8aac122bd4f6eR)的值域.

 

tanA=1, 【解析】(Ⅰ)由题意得 ························· 2分 因为cosA≠0, ···························· 3分 所以tanA=1. ····························· 4分 (Ⅱ)由(Ⅰ)知tanA=1得 ······················· 5分 =························ 6分 =····················· 7分 因为xR,所以.······················ 8分 当时,f(x)有最大值,··················· 10分 当sinx=-1时,f(x)有最小值-2,··················· 11分 所以所求函数f(x)的值域是··················   13分
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