x = e তে x এর সাপেক্ষে sin(ln x) + cos(ln x) এর অবকলন কত হবে?

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ধারণা:

গণনা:

ধরি, f(x) = sin(ln x) + cos(ln x)

আমরা যেমনটি জানি যে, 

⇒ 

⇒ 

আমরা যেমনটি জানি যে, ln(e) = 1

⇒ 

সুত্রাং, বিকল্প 1 হল সঠিক।

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