October 2018 1 44 Report
Tolong lagi ya .. soalnya gak ngerti caranya. Dengan menggunakan rumus identitas buktikan bahwa :
a. ( Cos x + Sin x ) ( Cos x - Sin x ) = 1 - 2 Sin^2 x
b. ( Sin x + Cos x )^2 - 2 tan x Cos^2 x = 1
c. ( Tan x + Sin x ) (1 - Cos x ) = Sin ^2 x tan x

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