What is expand-2/4 (1-s)(1-t)+(-1/4)(1+s)(1-t) ?

The solution to expand-2/4 (1-s)(1-t)+(-1/4)(1+s)(1-t) is (-1+t+s-st)/2+(-1+t-s+st)/4

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expand-2/4 (1-s)(1-t)+(-1/4)(1+s)(1-t)

expand

- \frac{2}{4} (1 - s) (1 - t) + (- \frac{1}{4}) (1 + s) (1 - t)

\frac{- 1 + t + s - s t}{2} + \frac{- 1 + t - s + s t}{4}

Solution steps

- \frac{2}{4} (1 - s) (1 - t) + (- \frac{1}{4}) (1 + s) (1 - t)

Simplify

(- \frac{1}{4}) (1 + s) (1 - t) : - \frac{1}{4} (1 + s) (1 - t)

= - \frac{2}{4} (1 - s) (1 - t) - \frac{1}{4} (1 + s) (1 - t)

Expand

- \frac{2}{4} (1 - s) (1 - t) : \frac{- 1 + t + s - s t}{2}

= \frac{- 1 + t + s - s t}{2} - \frac{1}{4} (1 + s) (1 - t)

Expand

- \frac{1}{4} (1 + s) (1 - t) : \frac{- 1 + t - s + s t}{4}

= \frac{- 1 + t + s - s t}{2} + \frac{- 1 + t - s + s t}{4}

(sin (x) + cos (x)) (sec (x) + csc (x))

\frac{125 + 4 x - 9 x ^{2}}{( x - 1 ) ( x + 3 ) ( x + 4 )}

\frac{d ^{2}}{d x ^{2}} ((y) ((3 x - 2)^{4}))

\frac{d}{d y} ((z (x)) (x y + sin (x y) + x))

\frac{( p + q + p - q ) ^{2}}{2 q}

What is expand-2/4 (1-s)(1-t)+(-1/4)(1+s)(1-t) ?
The solution to expand-2/4 (1-s)(1-t)+(-1/4)(1+s)(1-t) is (-1+t+s-st)/2+(-1+t-s+st)/4