Mathematics
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どこにどの加法定理使ってるんですか( ᵕ̩̩ ᵕ̩̩ )
(1) P(2cost, 2sint), Q(sin2t, cos2t) h
PQ2 = (sin2t-2 cost)2 + (cos2t - 2sint)²
=
=
sin² 2t - 4sin2t cost +4 cost + cos² 2t - 4cos2t sint+4sin²t
(sin² 2t+cos² 2t)+4(cost+sin²t)-4(sin2t cost + cos2t sint)v\3.
= 5-4sin3t
平
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