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अवकलज का प्रयोग करके निम्न का सन्निकटन मान ज्ञात कीजिए।

loge (10.02), जबकि log10 = 2.3026

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माना कि y = loge x

जहाँ x = 10, ∆x = 0.02

तथा x + ∆x = 10.02

y = logex

x के सापेक्ष अवकलन करने पर,

अब समीकरण (i) से,

y + ∆y = loge (x + ∆x)

loge x + ∆y = loge (x + ∆x)

loge 10 + 0.002 = loge (10.02)

loge (10.02) = 2.3026 + 0.002

loge (10.02) = 2.3046

अत: loge (10.02) का सन्निकटन मान 2.3046 है।

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