October 2018 1 28 Report
Tolong ya.. gimana caranya?!
Buktikan menggunakan rumus identitas :
a. (1+ tan²x) (1-cos²x) = tan²x
b. Cos⁴ (1-tan⁴x) = cos²x - sin²x
c. (Cos x per 1 - Sin x) - (Cos x per 1+ Sin x) = 2 tan x

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