<prompt> Tafuta pembe zote x, 0circ le x 180circ, vilesin 6x cos 4x 0.Ingiza suluhu zote, zikitenganishwa na koma.  <response>: Tunaweza kuandikasin 6x cos 4x sin 6x sin 90circ - 4x.Kisha kutoka kwa fomula ya jumla-kwa-bidhaa,anzaaligndhambi 6x dhambi 90circ - 4x 2 dhambi kushoto frac6x 90circ - 4x2 kulia cos left frac6x - 90circ - 4x2 kulia 2 dhambi x 45circ cos 5x - 45circ.mwishoalignHivyo, sin x 45circ 0 au cos 5x - 45circ 0.Ikiwa sin x 45circ 0, basi x 135circ.Ikiwa cos 5x - 45circ 0, basi 5x - 45circ lazima iwe 90circ, 270circ, 450circ, 630circ, au 810circ. Hizi husababisha suluhu 27circ, 63circ, 99circ, 135circ, 171circ. 