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2014-06-08T12:46:46+07:00
Tg x = a
sin x/cos x = a
sinx = a.cosx

sin 2x = 2 sinx.cosx
         = 2. a.cosx. cosx
         = 2a cos^2 x
2 3 2
2014-06-08T12:46:54+07:00
Tan x = a
tan x = sisi depan / sisi samping 
maka sisi miring = √a²+1

sin 2x = 2sinx cosx
= 2 (a/ √a²+1) (1/√a²+1)
= 2 (a/ a²+1)
= 2a / a²+1
7 3 7