Mathematics
Senior High
余弦定理
写真の問題の途中式と解答って合っていますか？
余弦定理より ってのと余弦定理の公式って書かなくても大丈夫ですかね？
A² = 2² + 3 ²³-2 x Zx 3 x Cos 60°
= 4 +9-8×2×3 * =
=13-6
7
よってa=17
x 70 F=¹ #15
a = √√7
(1) 余弦定理より
2
a² = b ² + c²-2bc cos A
= 22 +32 -2 × 2 ×3 × cos60°
1
2
=4+9-12 ×
=7
よって
a>0 だから
a= = √7
a=±√7
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