cosetsin.py

Created on November 23, 2021

325 Bytes

cos a=0.3 et sin a=?

on a cos2 a+sin2 a=1

<-->(0.3)2+sin2 a=1
<-->sin2 a=1-0.09
<-->sin2 a=0.91
<-->sin a=√0.91 ou sin a=-√0.91

si 0<a<pi alors sin a>0
  et donc sin a=√0.91environ0.95
  
si pi<a<2pi alors sin a<0
  et donc sin a=-√0.91environ-0.95

c'est un encadrement

sin a=0.7
arcsin(0.7)environ0.775

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