If sin 42° =2/3, then cos 48°=

Mathematics

2 answers:

Delvig [45]3 years ago

7 0

Sinα=cos(90-α) is a basic identity.

if sin42=2/3 then cos(90-42)=2/3 as well (90-42=48)

borishaifa [10]3 years ago

5 0

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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