if x=`2cos theta`,y=`2sin theta`and the range of `f(x,y)=x^(2)-xy+y^(2)` is [L,M] then the value of the product L.M is equal to

If x = 2 cos θ , y = sin θ and the range of f ( x , y ) = x2 − x y + y2 is [ L , M ] , then the value of the product L.M is equal to

If x=2cos theta -cos 2theta ,y=2sin theta -sin 2theta ,then (dy)/(dx) =

If x=4(l)/(1+l^(2)) and y=(2-2l^(2))/(1+l^(2)) wherel' is a parameter and range of f(x,y)=x^(2)-xy+y^(2) is[a,b ] then (a+b) is equal to

If x=a sin theta and y=b cos theta, what is the value of b^(2)x^(2)+a^(2)y^(2)?

If cot theta = (2xy)/(x^(2) - y^(2)) , then what is cos theta equal to ?

If x cos theta + y sin theta =2 is perpendicular to the line x-y =3 then what is one of the value of theta ?

If x = a cos theta ,y = b sin theta , then find the value of b^(2) x^(2) + a^(2) y^(2) - a^(2) b^(2) .

If x= 2sin^(2)theta and y= 2cos^(2)theta+ 1 then the value of x+ y is