展开 cos(x)(x-pi)

解答

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cos (x) (x - π)

x cos (x) - π cos (x)

求解步骤

cos (x) (x - π)

使用分配律:

a (b - c) = ab - a c

a = cos (x), b = x, c = π

= cos (x) x - cos (x) π

= x cos (x) - π cos (x)

e x p an d - \frac{1}{6} (x - 1) (x - 2)

e x p an d tan^{2} (x) - sin^{2} (x) (cot (c) o t x + tan (x))

e x p an d (1 + \frac{2 i}{n})^{3}

s im pl i f y (8 + sin (t))^{2} + cos^{2} (t)

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