Mathematics
Senior High
なぜこうやって消せるんですか？cosにも2がかかってますよね？
(2)
239
1-cos2a
sin2a
= tana
1-cos2a
sin2a
1-(1-2sin² α) JIRON
2sina cosa
2sin² a
2sina cosa
sina
cosa
= tand
ゆえに1cos2a
sin2a
tana 01
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