展开 (tan(x)-sin(x)sin(y))dx+(cos(x)cos(y))dy

解答

展开

(tan (x) - sin (x) sin (y)) d x + (cos (x) cos (y)) d y

tan (x) d x - sin (x) sin (y) d x + cos (x) cos (y) d y

求解步骤

(tan (x) - sin (x) sin (y)) d x + (cos (x) cos (y)) d y

乘开

d x (tan (x) - sin (x) sin (y)) : tan (x) d x - sin (x) sin (y) d x

= tan (x) d x - sin (x) sin (y) d x + (cos (x) cos (y)) d y

去除括号:

(a) = a

= tan (x) d x - sin (x) sin (y) d x + cos (x) cos (y) d y

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

s im pl i f y (3 i + 1)^{4}

e x p an d 4 (x^{\frac{1}{3}} + 1)^{7}

\frac{d ^{2}}{d x ^{2}} ((y) (4 y + 1))

e x p an d \frac{13 x + 6}{( x + 1 ) ( x - 1 )}