aadeemiteeoun2a8
aadeemiteeoun2a8
14-08-2017
Mathematics
contestada
please help!! I have no idea!!
Respuesta :
irspow
irspow
14-08-2017
If sinα=cosß it means that ß=90-α. This also means that α+ß=90 so we can say:
4k-22+6k-13=90
10k-35=90
10k=125
k=12.5°
...
The above identity comes up a lot, and is one worth committing to memory for sure.
sinα=cos(90-α) or vice versa cosα=sin(90-α)
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