展开 18cos(pi(4x-5t))+12cos(pi(4x-5t-1))

解答

展开

18 cos (π (4 x - 5 t)) + 12 cos (π (4 x - 5 t - 1))

18 cos (4 π x - 5 π t) + 12 cos (4 π x - 5 π t - π)

求解步骤

18 cos (π (4 x - 5 t)) + 12 cos (π (4 x - 5 t - 1))

乘开

π (4 x - 5 t) : 4 π x - 5 π t

= 18 cos (4 π x - 5 π t) + 12 cos (π (4 x - 5 t - 1))

乘开

π (4 x - 5 t - 1) : 4 π x - 5 π t - π

= 18 cos (4 π x - 5 π t) + 12 cos (4 π x - 5 π t - π)

e x p an d \frac{2 z + 1}{z ( z ^{2} + 1 )}

e x p an d 2 x (a x) + 6 x^{2} (b x) + 12 x^{2} (c x)

s im pl i f y (3 + 4 i)^{14}

s im pl i f y 3 (1 + \frac{4 y}{x} + \frac{4 y ^{2}}{x ^{2}})

e x p an d y - 0.25 (sin (x) + cos (y))