jazmynhawkins29
jazmynhawkins29
23-07-2017
Mathematics
contestada
If sin 42° =2/3, then cos 48°=
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mreijepatmat
mreijepatmat
23-07-2017
We know that: sin Ф = cos(π/2 - Ф) ↔ sin Ф = cos(90° - Ф)
Then:
sin 42° = cos(90° - 42°) = cos 48°
IF sin 42° = 2/3, the cos 48° = 2/3
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irspow
irspow
23-07-2017
sinα=cos(90-α) is a basic identity.
if sin42=2/3 then cos(90-42)=2/3 as well (90-42=48)
Answer Link
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