Question

• Why we take d/dx (sec x) =(tan x)(sec x) 
  
• If we take d/dx (sec x)=(sec x )( tan x) then our answer is wrong or right

Express 0.8+0.777+0.4333 in the form of p/q

Express 0.8+0.7777+0.43333 in the form of p/q

dy/dx=xe^y_x^2

proof for the sum of square of the n natural numbers

How to find observations from table

If it is given 50th and 51st observation is the median

if sum of 1st n terms of an ap is 2n+3n`2 find rth term

1+y^2) dx+2xydy =siny dy

1. Sadana went to a bank to withdraw 20000. She asked the cashier to give her 200 and 500 notes only. Sadana got 55 notes in all. Find how many notes of 200 and 500 she received??!

A*b*c ka formula 

In triangle abc angle C = 90 degree and D is the midpoint of BC prove that a b square + 3 AC square equals to 4AD square

In triangle abc xy is parallel to BC and it divides triangle ABC into two part of equal area prove that BX/AB=√2-1/√2

pq+parallel+rs+and+ps+%3D+pr+in+trapezium+prove+it+is+cyclic&oq=pq+parallel+rs+and+ps+%3D+pr+in+trapezium+prove+it+is+cyclic