Minta bantuannya dong.. 1 nmr jga tdk papa yg jawab nnti aku follow
Sakti2017
11) a) cos 3x - sin 6x - cos 9x) / (sin 9x - cos 6x - sin 3x) = tan 6x (cos 3x - cos 9x - sin 6x) / (sin 9x - sin 3x - cos6x) = tan 6x (2 Sin 6x.Sin 3x - Sin 6x) / (2Cos 6x.Sin 3x - Cos 6x) = Tan 6x [Sin6x (2Sin 3x - 1)] / [Cos 6x(2Sin 3x - 1)] = Tan 6x Sin6x / Cos 6x = Tan6x Tan 6x = Tan 6x ................. (Terbukti)
b) (sin 3x + sin 5x + sin 7x + sin 9x) / (cos 3x + cos 5x + cos 7x + cos 9x) = tan 6x [(sin 3x+sin 5x)+(sin 7x+sin 9x)] / [(cos 3x+cos 5x)+(cos 7x+cos 9x)] = tan 6x [2sin 4x Cosx + 2sin8xCosx] / [2cos4xCosx + 2cos8xCosx] = tan 6x [2Cosx(sin4x+sin8x)] / [2Cosx(cos4x+cos8x)] = tan 6x (sin4x+sin8x) / (cos4x+cos8x) = tan 6x (2Sin6xCos2x) / (2Cos6xCos2x) = tan6x Sin 6x / Cos 6x = tan 6x Tan 6x = Tan 6x ....................................... Terbukti
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ThreeSumomba
Mau bertanya kak.. itu yg 4 sama 8 dapat darimana ya?
(cos 3x - cos 9x - sin 6x) / (sin 9x - sin 3x - cos6x) = tan 6x
(2 Sin 6x.Sin 3x - Sin 6x) / (2Cos 6x.Sin 3x - Cos 6x) = Tan 6x
[Sin6x (2Sin 3x - 1)] / [Cos 6x(2Sin 3x - 1)] = Tan 6x
Sin6x / Cos 6x = Tan6x
Tan 6x = Tan 6x ................. (Terbukti)
b) (sin 3x + sin 5x + sin 7x + sin 9x) / (cos 3x + cos 5x + cos 7x + cos 9x) = tan 6x
[(sin 3x+sin 5x)+(sin 7x+sin 9x)] / [(cos 3x+cos 5x)+(cos 7x+cos 9x)] = tan 6x
[2sin 4x Cosx + 2sin8xCosx] / [2cos4xCosx + 2cos8xCosx] = tan 6x
[2Cosx(sin4x+sin8x)] / [2Cosx(cos4x+cos8x)] = tan 6x
(sin4x+sin8x) / (cos4x+cos8x) = tan 6x
(2Sin6xCos2x) / (2Cos6xCos2x) = tan6x
Sin 6x / Cos 6x = tan 6x
Tan 6x = Tan 6x ....................................... Terbukti