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

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

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

expand

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

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

Solution steps

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

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

\frac{( 2 n ^{2} + n + 1 ) ^{2}}{4}

\frac{1}{( s + a ) \cdot ( s + b ) ^{2}}

\frac{1}{5 ( x + 1 )}

(2 n + 1) π - \frac{π}{2}

(3 a^{2} c) 3

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