Find the equation of locus of all points such that the difference  of their  distances  from (4,0)and (-4,0) is always equal to 2

Elements maths 11class 

Suppose f is even. What is f0(0)? Draw a picture that illustrates this phenomenon.

Angle in a semicircle is a right angle

In a survey of 400 students

Integrate sinx/sqrt (2+sin2x)

Find mean deviations about median 
3,9,5,3,12,10,18,4,7,19,21

In  sequences and series chapter 9 ,q. 7  of miscellaneous ex., Why we take  y=1,2and2

Difference between Gram atomic mass and Relative atomic mass 

science slot are not given

Sir example 4th of chapter 13 of class 10th mein total surface area of bird bath mein - (CSA of cylinder + CSA of hemisphere+ base of a cylinder)    

Kya aise nahi hona chahiye sir