展开 (cos(θ)+0.35)^2

解答

展开

(cos (θ) + 0.35)^{2}

cos^{2} (θ) + 0.7 cos (θ) + 0.1225

求解步骤

(cos (θ) + 0.35)^{2}

使用完全平方公式:

(a + b)^{2} = a^{2} + 2 ab + b^{2}

(cos (θ) + 0.35)^{2} = cos^{2} (θ) + 2 cos (θ) \cdot 0.35 + 0.3 5^{2}

= cos^{2} (θ) + 2 cos (θ) \cdot 0.35 + 0.3 5^{2}

化简

cos^{2} (θ) + 2 cos (θ) \cdot 0.35 + 0.3 5^{2} : cos^{2} (θ) + 0.7 cos (θ) + 0.1225

= cos^{2} (θ) + 0.7 cos (θ) + 0.1225

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