拼角、凑角技巧11tan()tan27(0)1tan221已知－＝，＝－，且，，，求：的值；求－【例】的值．222tantan[()]11tan()tan127.111tan()tan3127122tan()42tan2(),11tan()314tan(2)tan[2()]41tan()tan371.411tan()tan1()1237...

时间:2024-11-20 06:06栏目:中学教育