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Continue to ChatHS Elective Mathematics V-1 by K. C. Nag https://www.worldmets.com/mathematics-books/higher-secondary-elective-mathematics-vol-1-by-k-c-nag-pdf/
HS Elective Mathematics V-1 by K. C. Nag https://www.worldmets.com/mathematics-books/higher-secondary-elective-mathematics-vol-1-by-k-c-nag-pdf/