Mathematics Senior High about 9 yearsago

三角関数の問題です。 0<α<π/2、π<β<3π/2でsinα=4/5、cosβ=-3/5。 sin(α+β)=-24/25。 cos(α-β)=-1。 この時のα-βの大きさを求めよ。

English Senior High almost 10 yearsago

I couldn't be that I had somewhat managed only to interact with the small number of New Yorkers for whom manners are important. With eac... Read More

English Junior High over 10 yearsago

1 yes, the picture is myself. I took my photo myself 2 why dear? 2はどうゆういみですか？