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Siva Prasad
Alumni- Indian Institute of Science(IISc), Bangalore; UPSC Mains'17;Stanford Reliance Fellowship Finalist; Telegram- akmsiva

Unacademy user
I think in sin^4 + cos^4 to find minima. We can follow the below method and powers are same. Put the value =45 degree. As they are reciprocal of each other you won't face any problem in getting the minima. Hope its helps.
Vikas Poonia
a year ago
If powers are same**
  1. District Administration Siva Prasad

  2. About Me Bachelors and Masters in Physics from Indian Institute of Science (ISc), Bangalore . INSPIRE Scholar, DST Govt. of India . Interested in Physics, current affairs, economics... . Physicist, Blogger, Teacher.... Wrote UPSC CSE Mains 2017 . Research Publication in Journal of Applied Physics

  3. Contents . Introduction Functions of District Collector Functioning Since Independence .New Functions in the era of LPG . Democratic Decentralization . Questions