展开 sin(t-2)u(t-2)

解答

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sin (t - 2) u (t - 2)

t u sin (t - 2) - 2 u sin (t - 2)

求解步骤

sin (t - 2) u (t - 2)

= u sin (t - 2) (t - 2)

使用分配律:

a (b - c) = ab - a c

u sin (t - 2) (t - 2) = u sin (t - 2) t - u sin (t - 2) \cdot 2

= u sin (t - 2) t - u sin (t - 2) \cdot 2

= t u sin (t - 2) - 2 u sin (t - 2)

e x p an d \frac{1}{( 2 + 3 x ) ^{2}}

e x p an d (- 4 x^{\frac{5}{3}} - 2) (5 x^{4} - 10 x)

e x p an d (\frac{1}{( 2 x + 2 )})^{3}

e x p an d e^{(2 - s) \cdot t} \cdot cos (3 \cdot t)

s im pl i f y 2 (1 + cos (x))