Solve : cos X + sin X = 0
Pls all answers in radians
thanks

cos (X) + sin (X) = 0 Subtract cos(x) from each side:sin(x) = -cos(x)Divide each side by cos(x) :sin(x) / cos(x) = -1But sin/cos = tangenttan(x) = -1x = 135° and 315°x = 3/4 pi radians  and  7/4 pi radians