Mathematics
Senior High
Solved
2sinxcosx=t^2−1からどうやってy＝t^2+t−1になりますか
(1) sinx+cosx=tb (sinx+cos x)²=t²
すなわち 1+2sinx cosx=12
よって 2sinx cosx=t2-1
ゆえに y=t+t-1
πT\
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すみません。これです。