(sin2x+2sinx^2)/1-tanx 化简
问题描述:
(sin2x+2sinx^2)/1-tanx 化简
答
①(sin2x+2sinx²)/1-tanx =2sinx﹙cosx+sinx﹚/[﹙cosx-sinx﹚/cosx]=2sinxcosx﹙cosx+sinx﹚²/﹙cos²x-sin²x﹚=tg2x·﹙cosx+sinx﹚² ②是不是;;1-tanx 应为 1+tanx ,如是(sin2x+2s...