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cos(b)= 11/14

解答

cos (b) = \frac{11}{14}

解答

b = 0.66694 \dots + 2 πn, b = 2 π - 0.66694 \dots + 2 πn

+1

度数

b = 38.21321 \dots^{\circ} + 36 0^{\circ} n, b = 321.78678 \dots^{\circ} + 36 0^{\circ} n

求解步骤

cos (b) = \frac{11}{14}

使用反三角函数性质

cos (b) = \frac{11}{14}

cos (b) = \frac{11}{14}

的通解

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

b = arccos (\frac{11}{14}) + 2 πn, b = 2 π - arccos (\frac{11}{14}) + 2 πn

b = arccos (\frac{11}{14}) + 2 πn, b = 2 π - arccos (\frac{11}{14}) + 2 πn

以小数形式表示解

b = 0.66694 \dots + 2 πn, b = 2 π - 0.66694 \dots + 2 πn

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