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受欢迎的三角函数 >

cos(θ)= 43/90

解答

cos (θ) = \frac{43}{90}

解答

θ = 1.07267 \dots + 2 πn, θ = 2 π - 1.07267 \dots + 2 πn

+1

度数

θ = 61.45963 \dots^{\circ} + 36 0^{\circ} n, θ = 298.54036 \dots^{\circ} + 36 0^{\circ} n

求解步骤

cos (θ) = \frac{43}{90}

使用反三角函数性质

cos (θ) = \frac{43}{90}

cos (θ) = \frac{43}{90}

的通解

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

θ = arccos (\frac{43}{90}) + 2 πn, θ = 2 π - arccos (\frac{43}{90}) + 2 πn

θ = arccos (\frac{43}{90}) + 2 πn, θ = 2 π - arccos (\frac{43}{90}) + 2 πn

以小数形式表示解

θ = 1.07267 \dots + 2 πn, θ = 2 π - 1.07267 \dots + 2 πn

作图

流行的例子

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