plz. illustrate with a figure

can anybody tell me what rank should i get in aieee , iit ,and upseat to get a btech cs stream?????

can any body plz solve this question.....

a spherical capacitor of radius R is charged to a potential of V find energy stored in the electric field of concentric spherical shell of radius 2R

evaluate lim 1/x² -cot²x while x tends to zero

i am really confused as which book to take...... i mean arihant diff. calculus is alright but ive also heard of the one by ml khanna????plz help do refer any other book on diff calculus that you know???

lim cotx ^sin2x  

^{while x tends to 0}