Mathematics
Senior High
Solved
途中式にマイナスを書いているのに答えがプラスした数になっているのがなぜか分からないです。
(2) sin(a-B)
=
sinacos β-cosasin β
3
5
56
59
65
-
12
13
>>0
(3) cos(a+β)
=
45 D
5
13
cosa cosβsinasin β
c)
(8+)nst
4
12
35+
==
5
13
5
13
All
65
Answers
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