展开 cos(2t)μ(t-pi)

解答

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cos (2 t) μ (t - π)

t μ cos (2 t) - π μ cos (2 t)

求解步骤

cos (2 t) μ (t - π)

= μ cos (2 t) (t - π)

使用分配律:

a (b - c) = ab - a c

a = cos (2 t) μ, b = t, c = π

= cos (2 t) μ t - cos (2 t) μ π

= t μ cos (2 t) - π μ cos (2 t)

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