buktikan (sin 3x + sin 5x + sin 7x + sin 9x) per (cos 3x + cos 5x + cos 7x + cos 9x) = tan 6x
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(cos 3x + cos 5x) + (cos 7x + cos 9x) 2Cos4xCosx + 2Cos8xC0sx
= Sin4x + Sin8x
Cos4x + Cos8x
= 2Sin6xC0s2x
2Cos6xCos2x
= Sin6x
Cos6x
= Tan 6x