Hi i had tried the using equation editor in an ole object

but the symbol is too big in size and the subscript and superscript is too far from the letter.

Is there any method of control the font size?
i would suggest using equation editor in word, to start, till you find out what some of the options are, you can change sizes for super and subscripts, also change kerning to move things closer together also define new sizes
if you are using similar equations regularly you can save in a word document or similar then just copy to your app
you can also change spacing by rescaling the object, by width or height