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受欢迎的三角函数 >

cos(x)=0.818

解答

cos (x) = 0.818

解答

x = 0.61287 \dots + 2 πn, x = 2 π - 0.61287 \dots + 2 πn

+1

度数

x = 35.11491 \dots^{\circ} + 36 0^{\circ} n, x = 324.88508 \dots^{\circ} + 36 0^{\circ} n

求解步骤

cos (x) = 0.818

使用反三角函数性质

cos (x) = 0.818

cos (x) = 0.818

的通解

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

x = arccos (0.818) + 2 πn, x = 2 π - arccos (0.818) + 2 πn

x = arccos (0.818) + 2 πn, x = 2 π - arccos (0.818) + 2 πn

以小数形式表示解

x = 0.61287 \dots + 2 πn, x = 2 π - 0.61287 \dots + 2 πn

作图

流行的例子

sin(x)=(150)/(212.6)(sin(115))

sin (x) = \frac{150}{212.6} (sin (11 5^{\circ}))

16 cos (2 θ) - 9 = 0

(sin^2(θ)-2sin(θ)+1)/(sin(θ)-1)=-1

\frac{sin ^{2} ( θ ) - 2 sin ( θ ) + 1}{sin ( θ ) - 1} = - 1

solvefor w,100cos(10w)=50

so l v e f or w, 100 cos (10 w) = 50

cos (θ) = \frac{8}{25}