Tann造句
KearnsgothispatentrightsbackfromTann.TheyagreedthatKearnswouldassignhisrightstotheintermittentwipertoTann,andTannwouldtakeoverthecostofgettingthepatents.Kearnsfinallytookaction:“Iwaitedforarainyday,t...
KearnsgothispatentrightsbackfromTann.TheyagreedthatKearnswouldassignhisrightstotheintermittentwipertoTann,andTannwouldtakeoverthecostofgettingthepatents.Kearnsfinallytookaction:“Iwaitedforarainyday,t...
问题详情:用数学归纳法*:tanα·tan2α+tan2α·tan3α+…+tan(n-1)α·tannα=-n(n∈N*,n≥2).【回答】*(1)当n=2时,右边=-2=-2==tanα·tan2α=左边,等式成立.(2)假设当n=k(k∈N*且k≥2)时,等式成立,即tanα·tan2α+tan2α·tan3α+…+tan(k-1)...