13quickest way...
to do it within 30 seconds
put
x=a and y=b
then α=180°
[4]
8 Answers
3sin inv x/a*√b2-y2/b + y/b*√a2-x2/a = α
x/a*√b2-y2/b + y/b*√a2-x2/a =sinα
square ans see wat ur gettin[1]
13
1from where iitim... has left...
squaring ...
x2/a2 + y2/b2 + 2xy/ab[x/a. y/b - √1- x^2/a^2.√1- y^2/b^2] = sin2α
=> option C.
since 2xy/ab[x/a. y/b - √1- x^2/a^2.√1- y^2/b^2] = cosα
1its ans is c take different option and satisfy it no need to solve yaar
1ya itz C ..........im too on rahul's side.........itz time saving........[1][1][1][1][1][1]..............
