展开-(2x+1)cos(5)

解答

展开

- (2 x + 1) cos (5)

- 2 x cos (5) - cos (5)

求解步骤

- (2 x + 1) cos (5)

= - cos (5) (2 x + 1)

使用分配律:

a (b + c) = ab + a c

- cos (5) (2 x + 1) = - cos (5) \cdot 2 x - cos (5) \cdot 1

= - cos (5) \cdot 2 x - cos (5) \cdot 1

化简

- cos (5) \cdot 2 x - cos (5) \cdot 1 : - 2 x cos (5) - cos (5)

= - 2 x cos (5) - cos (5)

e x p an d \frac{1}{( n + 1 ) \cdot ( n + 2 )}

e x p an d - (2 x + 1) cos (2)

e x p an d \frac{3 w ^{2} - 5 w + 14}{( 4 w + 8 ) ( w + 2 )}

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

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