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sinx + cosx = cosx^2 - sinx^2 = sinx.cosx.sinx + cosx = cosx + sinxcosx - sinx = sinxcosxsinx + cosx = sinx + cosxsinxcosx + sinx - cosx = 0 Giải: sinx + cosx = 0 = tanx = -1 do cosx khác 0 = x = - pi / 4 + k * pik thuộc ZGiải: sinxcosx + sinx - cosx = 0 = sinx1 + cosx = cosx = sinx1 + cosx = 1 + cosx -1