lizzybellyoung lizzybellyoung
  • 13-11-2017
  • Mathematics
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Which of these is equal to cos 19°? A) sin 71° B) sin 81° C) cos 71° D) cos 81°

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MonsieurPengu
MonsieurPengu MonsieurPengu
  • 13-11-2017
cos α = sin (90-α) so cos 19 = sin 90-19 = sin 71
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swaggernaut
swaggernaut swaggernaut
  • 13-11-2017
cos 19° = sin 71°

A: sin 71° 

since sin is basically the inverse of cos, you can do 90-19 = 71.
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