展开 sin(x)(sin(x)*cos(x)-2)

解答

展开

sin (x) (sin (x) \cdot cos (x) - 2)

sin^{2} (x) cos (x) - 2 sin (x)

求解步骤

sin (x) (sin (x) cos (x) - 2)

使用分配律:

a (b - c) = ab - a c

sin (x) (sin (x) cos (x) - 2) = sin (x) sin (x) cos (x) - sin (x) \cdot 2

= sin (x) sin (x) cos (x) - sin (x) \cdot 2

化简

sin (x) sin (x) cos (x) - sin (x) \cdot 2 : sin^{2} (x) cos (x) - 2 sin (x)

= sin^{2} (x) cos (x) - 2 sin (x)

e x p an d R (7, - 8) y S (- 1, 2)

e x p an d (x - x - 2) (x + 4)

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

e x p an d \frac{100 ( 1.1 - j ^{0.1732} )}{0.9 + j ^{0.1732}}

e x p an d \frac{( k + 1 ) ^{3}}{4}