find exact value
if sin(x) = (4/5), then find the exact value of the following:
a. tan(x)
b. sin(2x)
this is what i did to b.
2 sinx cosx
2 (4/5)(3/5)
2(12/25)
24/25
i got cos x by the pyth theorm (x^2+y^2=r^2)
im really confused cause it says it might have two answers and what not..so please help
