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04062010  #1 
Join Date: Mar 2010
Posts: 9

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 
04072010  #2  
Join Date: Dec 2008
Posts: 249

Quote:
Part A. Quad III: tan(x) = opp/adj = 4/3 = 4/3 Quad IV: tan(x) = opp/adj = 4/3 Part B. sin(2x) = 2sin(x)cos(x) Quad III: = 2(4/5)(3/5) = 24/25 Quad IV: = 2(4/5)(3/5) = 24/25 Hope this helps! 

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