y=α7x হলে dy/dx = কত?
A. alpha^(7x)(7xlogalpha)
C. alpha^(7)(7logalpha^x)
সঠিক উত্তরঃ
D.
alpha^(7x)(7logalpha)
Explanation: 
Another Explanation (5):
y=α7x হলে dy/dx নির্ণয়:
আমরা জানি, \(\frac{d}{dx}a^x = a^x \log a\)
এখানে, y=α7x
dy/dx = \(\frac{d}{dx}\)(α7x)
এখন, 7x = z ধরলে,
dy/dx = \(\frac{d}{dz}\)(αz) \(\frac{dz}{dx}\)
= αz logα \(\frac{d}{dx}\)(7x)
= α7x logα × 7
= 7α7x logα
∴ dy/dx = α7x(7logα)
