展开 2cos(2)(x-pi/3)-1

解答

展开

2 cos (2) (x - \frac{π}{3}) - 1

2 cos (2) x - \frac{2 π}{3} cos (2) - 1

求解步骤

2 cos (2) (x - \frac{π}{3}) - 1

乘开

2 cos (2) (x - \frac{π}{3}) : 2 cos (2) x - \frac{2 π}{3} cos (2)

= 2 cos (2) x - \frac{2 π}{3} cos (2) - 1

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

e x p an d \frac{1}{x ( x + 5 )}

e x p an d \frac{- a ( b - 2 a ) + 3 c ( - b - 2 a )}{a ( b - 2 a ) + 3 c ( b - 2 a )}

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

\frac{d ^{2}}{d x ^{2}} ((z (x, y)) (x^{2} y^{2} - y^{3} + 3 x^{4} + 5))