যদি $F(x) = |\begin{matrix}f(x)&\phi(x)\ g(x)&\phi(x)\end{matrix}|$ হয়, তবে প্রমাণ কর যে, $F(x+h)-F(x)=|\begin{matrix}f(x+h)-f(x)&\phi(x+h)\ g(x+h)-g(x)&\phi(x+h)\end{matrix}|+|\begin{matrix}f(x)&\phi(x+h)-\phi(x)\ g(x)&\phi(x+h)-\phi(x)\end{matrix}|$

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সঠিক উত্তর: । ব্যাখ্যা:

যদি \(F(x) = |\begin{matrix}f(x)&\phi(x)\\ g(x)&\phi(x)\end{matrix}|\) হয়, তবে প্রমাণ কর যে, \(F(x+h)-F(x)=|\begin{matrix}f(x+h)-f(x)&\phi(x+h)\\ g(x+h)-g(x)&\phi(x+h)\end{matrix}|+|\begin{matrix}f(x)&\phi(x+h)-\phi(x)\\ g(x)&\phi(x+h)-\phi(x)\end{matrix}|\)