展开 4cos(t-2)u(t-2)

解答

展开

4 cos (t - 2) u (t - 2)

4 t u cos (t - 2) - 8 u cos (t - 2)

求解步骤

4 cos (t - 2) u (t - 2)

= 4 u cos (t - 2) (t - 2)

使用分配律:

a (b - c) = ab - a c

4 u cos (t - 2) (t - 2) = 4 u cos (t - 2) t - 4 u cos (t - 2) \cdot 2

= 4 u cos (t - 2) t - 4 u cos (t - 2) \cdot 2

化简

4 u cos (t - 2) t - 4 u cos (t - 2) \cdot 2 : 4 t u cos (t - 2) - 8 u cos (t - 2)

= 4 t u cos (t - 2) - 8 u cos (t - 2)

e x p an d t + z (cos (t)) d t + (sin (t) - 3 z^{2} + 5) d z

e x p an d lo g_{10} (3) (x + 5)

e x p an d (u - 1) u

e x p an d (sec (θ) + tan (θ)) (sin (θ) - 1)

s im pl i f y (2 i + 1)^{4}