If it looks like a product of two different functions, I go for parts; if one part is clearly a derivative of the inside, substitution is the path. Honestly, thirty seconds is too little for such a weighty decision—in life and in maths, we often need a moment of quiet to see clearly. I think of my son in Bangalore, who must make quick decisions at his job, but he always reminds me that even engineers step back to breathe. My own father, with his arthritis, teaches me that forcing a quick solution often worsens the pain. So, take a full minute, it is sari—sometimes the obvious shortcut is not the sakkat one.
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