Use formula for tan(a+b)

Note tan(arcsin(1/3)) = 1/sqrt(8) Draw a rt triangle with an angle whose sine is 1/3 you should get a 1-sqrt(8)- 3 triangle

tan(arcos(1/2)) = sqrt(3) Draw a rt triangle with an angle whose cosine is 1/2 you should get a 1 - sqrt(3) - 2 triangle