https://schoolofwisdom.com/ The only good guru is a kangaroo.
Answer to Why do some people say that roots are the opposite of exponents while some people say that logarithms are the opposite of exponents? by Alon Amit (אלון עמית) https://www.quora.com/Why-do-some-people-say-that-roots-are-the-opposite-of-exponents-while-some-people-say-that-logarithms-are-the-opposite-of-exponents/answer/Alon-Amit?ch=18&oid=358248951&share=134701e4&srid=hIX1P&target_type=answer
Answer to What is the longest math equation you’ve done and how long did it take? by Thành Đạt Lê https://www.quora.com/What-is-the-longest-math-equation-youve-done-and-how-long-did-it-take/answer/Th%C3%A0nh-%C4%90%E1%BA%A1t-L%C3%AA?ch=18&oid=41322754&share=35234282&srid=hIX1P&target_type=answer
https://youtu.be/H-kA3UtBj4M Easy question, tough answer.
Answer to A circle passes through the point (-1,1), (0,6) and (5,5). What is the equation of the circle? by Roman Andronov https://www.quora.com/A-circle-passes-through-the-point-1-1-0-6-and-5-5-What-is-the-equation-of-the-circle/answer/Roman-Andronov?ch=18&oid=286276831&share=e903765e&srid=hIX1P&target_type=answer