Jeżeli sin a;fa 4/5 i alfa to kąt ostry to:
a. cos alfa = -3/5
b. cos alfa =1/5
c. cosa 3/5
d. cosa 16/25
cos²x=1-sin²x
cos²x=1-16/25
cos²x=9/25
cosx=3/5
Odp. C
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cos²x=1-sin²x
cos²x=1-16/25
cos²x=9/25
cosx=3/5
Odp. C