Mathematics
Senior High
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答えのようにsin50度をcos40度にするのではなく、sin40度をcos50度にすることは一緒のことですか?
BA
303 次の式の値を求めよ。
(1) sin ²40° + sin ²50°
Sin 40° = sin( 90°-40°) = COS 50°
COS²50° + Sin 50" = |
(2)* sin 25° cos 65° + sin 65° cos 25°
COS 65°= cos (90°- 65°)
Sin 25°. sin 25
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sin 50°= sin (90°-40°) = cos 40°
よって与式=sin"40" + cos240°=1
(2) cos65° = cos(90°-25°)=sin 25°
sin 65*=sin(90°-25°) = cos 25°
=sin 25's in 25' + cos25 cost
= sin³25" + cos²25º = 1
(3) tan55"=tan(90° - 35°) =
tan 35
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ありがとうございます!よくわからなかったので助かりました