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z = f(x + ay) + ∅(x - ay) সমীকরণ থেকে স্বেচ্ছামূলক অপেক্ষকগুলিকে বাদ দিয়ে একটি আংশিক অবকলন সমীকরণ তৈরি করুন।

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ধারণা:

z = f(x + ay) + ∅(x - ay)..............(i)

উভয় পক্ষকে y এর সাপেক্ষে অবকলন করে পাই:

উভয় পক্ষকে আবার y এর সাপেক্ষে অবকলন করে পাই:

...............(ii)

সমীকরণ (i) কে x এর সাপেক্ষে অবকলন করে পাই:

............(iii)

সমীকরণ (iii) কে (ii) তে প্রতিস্থাপন করে পাই:

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