I tried doing these and i got to imaginary numbers when i was trying to solve for x, can anyone help?
sin^2(x) + 3cos^2(x) = 0: Restriciting to real numbers, the sum of two squares is always greater than or equal to 0. But sin^2(x) and cos^2(x) cannot simultaneously equal 0 for any real value of x. Therefore .....
This would not happen if they stopped after completing the necessary working.
All comment welcome.