msingh 3 years ago prove that the length of the perpendicular from the origin to the straight line joining the two points having coordinates ( a cos alpha, a sin alpha) and (a cos beta, a sin beta) is a cos { ( alpha + beta)/2}.

1. sauravshakya

First find equation of the line passing through ( a cos alpha, a sin alpha) and (a cos beta, a sin beta)

2. msingh

vat after that

3. shamim

may i know ur calculated eqution for those 2 given points$(a \cos \alpha , a \sin \alpha) , (a \cos \beta ,a \sin \beta)$

4. msingh

(y - asinα)=[(asinβ-asinα)/(acosβ-acosα)]*(x-acosα)

5. shamim

did u solve ur problem

6. shamim

if u need more help then plz ask

7. msingh

yes i need help