Mathematics
Senior High
287(6)を教えてください
cosα＝3/5 cosβ＝−5/13です。
答えは、1/√5です
お願いします🤲
12
のとき,次
4
287 0<a<,<B<ぇで, sina=
-, sinβ =
ニ
2,2
5'
13
の値を求めよ。
(1) sin(a+ B)
(2) cos(α- B)
(3) sin2α
(4) cos28
( tan2a
(6) sin
2
大 uキ8
| Exercise A
000*
o +
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