<![CDATA[The background of the research is textual book that less support the student to learn to find a concept independently. This research has purpose to develop guided discovery-based module on equation and identity of trigonometry subjects that valid and practical in class X MIA SMAN 1 Rambatan. The kind of study is research and development with IDI model. The define stage consist of syllabus analysis, text book analysis, literature analysis, and interview by teacher and student. Develop section is done the planning of module. Then, evaluation section is done exam validity and practicality. The results of exam module validity shows that this module on characteristic wich very valid namely 83%. The results of exam practicality by the teacher shows that this module on characteristic wich practical namely 78% and the result of exam practicality by the student shows that this module on characteristic which very practical namely 96%. It can be concluded that guided discovery-based module on equation and identity of trigonometry subjects is valid and practical.]]>
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