Given `A = {2,4,5 }, B = {2, 5}, C = {3, 4}` and `D = {1, 3, 5}`, check if `(A ∩ C) × (B ∩ D) = (A × B) ∩ (C × D)` is true?

Answer

A, B

Explanation

`f(x)=(7tan^(6)x-3tan^(2)x).sec^(2)x`
`:.int_(0)^((pi)/4)f(x)dx=int_(0)^(1)(7t^(6)-3t^(2))dt=(t^(7)-t^(3))_(0)^(1)=0`
Now `int_(0)^((pi)/4)xf(x)dx=int-(0)^(1)(7t^(6)-3t^(2))tan^(-1)tdt`
`=(tan^(-1)t.(t^(7)-t^(3)))_(0)^(1)-int_(0)^(1)-int_(0)^(1)(t^(7)-t^(3))1/(1+t^(2))dt`
`=int_(0)^(1)(t^(3)(1-t^(4)))/(1+t^(2))dt=int_(0)^(1)t^(3)(1-t^(2))dt=1/4-1/6=1/1`