展开 cos(t-1)U(t-1)

解答

展开

cos (t - 1) U (t - 1)

t U cos (t - 1) - U cos (t - 1)

求解步骤

cos (t - 1) U (t - 1)

= U cos (t - 1) (t - 1)

使用分配律:

a (b - c) = ab - a c

U cos (t - 1) (t - 1) = U cos (t - 1) t - U cos (t - 1) \cdot 1

= U cos (t - 1) t - U cos (t - 1) \cdot 1

化简

U cos (t - 1) t - U cos (t - 1) \cdot 1 : t U cos (t - 1) - U cos (t - 1)

= t U cos (t - 1) - U cos (t - 1)

e x p an d (a^{2} - \frac{1}{4})^{4}

e x p an d \frac{( e ^{- 7 s} )}{( s - 3 ) ( s - 1 )}

e x p an d 2 x y d x + (1 + x^{2}) d y

\frac{d}{d t} ((x) (t + 1))

s im pl i f y (x - y + 1) (x + y - 1)