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Minimum and Maximum Value
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A very important video where we learn to evaluate the maximum and minimum of the function by using Trigonometry instead of Calculus.

Sachin Rana
IIIrd Year UG, IITB | 115/120 in Maths in JEE Main (2016) | Qualified NSEA (Astronomy Olympiad) | YouTuber with over 71,000 subscribers.

Unacademy user
Wonderfully made questions. Just a suggestion - To make it closer to how UPSC frames questions, you could avoid including a particular correct statement in all the four options (e.g. Q5 in Elections and Representation) because most questions are solved by eliminating options ;)
sir cos^2x -cosx =(cosx-1/2)^2-1/4 and then frm this how, -1/4<cos^2x-cosx<2 came sir plz tell
How would you approach this question, the expression Asin²x + Bsinxcosx + Ccos²x lies between?
Sir I solved last problem within 3 steps in different method and the way of your teaching liked me a lot. Thank you sir.
Bhaiya, in d last question, what wud hv been d minimum value of sinA.sinB? as there will be a domain of theta...
Sachin Rana
6 months ago
The minimum value will be -1/2 and the maximum value is 1/2.
  1. dit, enlculate the min. and mon 00099+ bgrnQ a+b


  2. We know 212 atb Thus


  3. ma and mui aol the n 2 Now


  4. 2 2 5


  5. ( ).ceas =) 2