a circular park of radius 20m is situated in a coloney. three boys ankur,syed and david are sitting at equal distance on its boundary each having a toy telephone in his hands to talk each other. find the length of the string of each phone
If a sin θ - b cos θ = c and , a cos θ + b sin θ = √(a 2 + b2 - c 2 ).prove that sinθ= cosθ or a≤ = b≤
The sum of n terms of a series for all value of n is n^2+3n. Find the first 3 terms of the series?