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The area of triangle having angular poin...

The area of triangle having angular points `P(a cos theta _1, b sin theta _1) ,Q(a cos theta _2, b sin theta_2) and R(cos theta_3, b sin theta_3) ` is

A

` 2a b sin"" (theta_1- theta_2)/(2) sin"" (theta_2-theta_3)/(2) sin"" (theta_3- theta_1)/(2) `

B

` 2ab sin" " (theta_1+theta_2) sin (theta_2+theta_3) sin ""(theta_3+ theta_1) `

C

` ab sin "" (theta_1- theta_2)/(2) sin ""(theta_2- theta_3)/(2) sin ""(theta_3- theta_1)/(2)`

D

none of these

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The correct Answer is:
A
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