Send the following on WhatsApp
Continue to ChatHS Elective Mathematics Part-1 by Keshab Chandra Nag PDF https://www.thegreenexpress.in/keshab-chandra-nag/hs-elective-mathematics-part-1/hs-elective-mathematics-part-1-by-keshab-chandra-nag-pdf/
HS Elective Mathematics Part-1 by Keshab Chandra Nag PDF https://www.thegreenexpress.in/keshab-chandra-nag/hs-elective-mathematics-part-1/hs-elective-mathematics-part-1-by-keshab-chandra-nag-pdf/