Question

AuB=B and AnB=A then find the value of A-B? ​

Answer 1

Answer:A

Step-by-step explanation:AnB=A so it take only intersected part and AuB=B it take whole union part but when we minus Ato B then A accepted only A part give same type of question in numerical then I can explain you better

Answer 2

Answer:

Step-by-step explanation:= (Tan 60 - tan 18) / (1+tan60 tan18)  * (tan60 + tan18) / (1 - Tan60 tan18)

= (√3 - tan18) (√3 + tan18) / [ (1+√3 tan18)(1-√3 tan18) ]

= (3 - tan²18) / (1 - 3 tan²18)      ---- (1)

=  (3 Cos²18 - Sin²18) / (Cos²18 - 3 Sin²18)

=  (3 - 4 Sin²18) / (4 Cos²18 - 3)

=  [ Sin 3*18 / Sin 18 ] / [ Cos 3*18 / Cos 18 ]

= Tan 54 / Tan 18                                       ---- (2)

    from the formula Sin 3A = sinA (3 - 4 sin²A)  and Cos3A = CosA (4 Cos²A - 3)

Tan 6 Tan 66