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Dec 25, 2024 at 20:46 comment added yarchik This is a mathematical not numerical problem. I do not understand why this solution is accepted. Numerics can only give hints, not a definite answer.
Dec 25, 2024 at 5:29 vote accept John Paul Peter
Dec 25, 2024 at 3:57 comment added JimB So your fist answer is $t=0$ which corresponds to $x=0$ and your second answer is $t=-1$ which corresponds to $x=-\pi/2$. I think there are an infinite number of values of $x$ that result in the maximum value of 1. A plot of the function is handy.
Dec 25, 2024 at 3:42 history edited minhthien_2016 CC BY-SA 4.0
added 143 characters in body
Dec 25, 2024 at 3:27 history answered minhthien_2016 CC BY-SA 4.0