if: xsin(A) + ycos(A) = R and xcos(A) - ysin(A)= Q
Find the value of (x^2) + (y^2)
Hello again, white_cap!
It's one of those thing we learn to watch for.
When I see both and , that technique come to mind
It turns up regularly in Parametric Equations.
Eliminate the parameter .
Get an equation involving and (only).
We have: .
Square the equations: .
Add the equations: .
Therefore: . . . . . There!