Expression 4: "A" Subscript, "B" "C" "D" , Baseline equals StartFraction, 21 times 3 Over 2 , EndFraction equals 31.5ABCD=21·32
equals=
31.531.5
4
Expression 5: "B" Subscript, "C" "D" , Baseline equals cosine to the negative 1st power left parenthesis, StartFraction, 3 squared plus 21 squared minus "B" squared Over 2 times 3 times 21 , EndFraction , right parenthesis equals 90BCD=cos−132+212−B2D2·3·21