Which of these is equal to cos 19°? A) sin 71° B) sin 81° C) cos 71° D) cos 81°
2 answers:
Cos α = sin (90-α) so cos 19 = sin 90-19 = sin 71
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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