prove that 1+tan^2theta=sec^2theta
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• NCERT Book for Class 10 Social Science (History) Chapter 1 The Rise of Nationalism in Europe is available for reading or download on this page. Students who are in class 10th or preparing for any exam which is based on Class 10 History can refer to NCERT History (India and the Contemporary World -II) Book for their preparation. Digital NCERT Books Class 10 History (India and the Contemporary World -II) pdf are always handy to use when you do not have access to the physical copy.
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