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受欢迎的三角函数 >

cos(θ)=(5/(sqrt(29)))

解答

cos (θ) = (\frac{5}{29})

解答

θ = 0.38050 \dots + 2 πn, θ = 2 π - 0.38050 \dots + 2 πn

+1

弧度

θ = 0.38050 \dots + 6.28318 \dots n, θ = 5.90267 \dots + 6.28318 \dots n

求解步骤

cos (θ) = (\frac{5}{29})

化简

\frac{5}{29} : \frac{5 29}{29}

\frac{5}{29}

乘以共轭根式

\frac{29}{29}

= \frac{5 29}{29 29}

2929 = 29

2929

使用根式运算法则:

a a = a

2929 = 29

= 29

= \frac{5 29}{29}

cos (θ) = \frac{5 29}{29}

使用反三角函数性质

cos (θ) = \frac{5 29}{29}

cos (θ) = \frac{5 29}{29}

的通解

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

θ = arccos (\frac{5 29}{29}) + 2 πn, θ = 2 π - arccos (\frac{5 29}{29}) + 2 πn

θ = arccos (\frac{5 29}{29}) + 2 πn, θ = 2 π - arccos (\frac{5 29}{29}) + 2 πn

以小数形式表示解

θ = 0.38050 \dots + 2 πn, θ = 2 π - 0.38050 \dots + 2 πn

作图

流行的例子

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