maths
posted by Vin Mwale .
if cosine A=0•8 find sine B

maths 
Damon
I guess you mean find sin A because I have no idea what B is
cos^2 + sin^2 = 1
0.8^2 + sin^2 = 1
sin^2 = 10.64 = 0.36
sin = +/ sqrt(0.36) 
maths 
Steve
as shown above, sinA = ±0.6
or, you can see that if you draw a triangle, it is just a scaleddown 345 triangle. so if sinA = 4/5, cosA = 3/5.
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