[" ABCD in a trapertical auch that "AB" and "CD" are parallel and "BC perp CD" .If "/_ADB=theta.8C=P" and "CD" ."],[" Then AB in equal to: "],[[" (1) "((p^(2)+q^(2))sin theta)/(" paose "+q sin theta)," (2) "(p^(2)+q^(2)cos theta)/(p cos theta+q sin theta)," (3) "(p^(2)+q^(2))/(p^(2)cos theta+q^(2)" sing ")," (4) "((p^(2)+q^(2))sin theta)/((p cos theta+q" iner ")^(2))]]