展开 cos(t)h(t-pi)

解答

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cos (t) h (t - π)

t h cos (t) - πh cos (t)

求解步骤

cos (t) h (t - π)

= h cos (t) (t - π)

使用分配律:

a (b - c) = ab - a c

a = cos (t) h, b = t, c = π

= cos (t) h t - cos (t) hπ

= t h cos (t) - πh cos (t)

e x p an d 3 - 3 [3 - \frac{( 2 + ( - 5 ) )}{( 3 - 6 )}] - 2 [2 - (- 6)]

e x p an d - \frac{50 x ^{4}}{( x ^{5} + 5 ) ( x ^{5} - 5 )}

e x p an d (3, 4) y (- 2, - 3)

e x p an d \frac{1 - 3 x ^{2}}{x ( 1 - x ^{2} )}

e x p an d (1 + 2 x + x^{2})^{8}