Hello : I have a problem about trigonometry ... please help me ... thanks determine the sum of the angles A,B where 0 <= A , B <= 180 (degrees) sinA + sinB = sqr(3/2) , cosA + cosB = sqr(1/2) i thank you at first for your help ... david Hi David,Try using the formulas for the sums of trig functions: cosA + cosB = 2cos((A+B)/2) cos((AB)/2) Chris
