April 2019 1 43 Report
Apabila dinyatakan dalam perkalian, cos 8x-cos 2x akan berupa...

A. -2sin²6x
B. -2sin 10x sin 6x
C. -2sin 8x sin 2x
D. -2sin 5x sin 3x
E. -2sin 5x sin 2x

mohon bantuanya :)

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