What is expand (x+dx)(-ycos(x)) ?

The solution to expand (x+dx)(-ycos(x)) is -xycos(x)-ycos(x)dx

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expand (x+dx)(-ycos(x))

expand

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

- x y cos (x) - y cos (x) d x

Solution steps

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

Apply the distributive law:

a (b + c) = ab + a c

a = (- y cos (x)), b = x, c = d x

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

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

Remove parentheses:

(- a) = - a

= - x y cos (x) - y cos (x) d x

- 1 (a + b = x + 2) - 1

- \frac{1}{s ^{2} ( s + 1 )}

((e^{x} - e^{- x}))^{2}

y (I n y^{2} - V y + 1) V d x + x d V - V y d y

\frac{4 ( - y + 9 )}{5}

What is expand (x+dx)(-ycos(x)) ?
The solution to expand (x+dx)(-ycos(x)) is -xycos(x)-ycos(x)dx