展开 5cos(u)*(2-sin(u))

解答

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5 cos (u) \cdot (2 - sin (u))

10 cos (u) - 5 cos (u) sin (u)

求解步骤

5 cos (u) (2 - sin (u))

使用分配律:

a (b - c) = ab - a c

5 cos (u) (2 - sin (u)) = 5 cos (u) \cdot 2 - 5 cos (u) sin (u)

= 5 cos (u) \cdot 2 - 5 cos (u) sin (u)

数字相乘:

5 \cdot 2 = 10

= 10 cos (u) - 5 cos (u) sin (u)

s im pl i f y 3 (lo g_{4} (x) + 1)

e x p an d \frac{k ^{7} + 3}{2 k ^{4}}

e x p an d (1 + 21 t)^{2} + (1 + 21 t)^{2}

e x p an d A (5, - 6) B (- 7, 2)

\frac{d}{d t} ((x) (t^{3} - t^{2}))