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受欢迎的三角函数 >

cos(C)=(5^2+4.05^2-3^2)/(2(4.055))

解答

cos (C) = \frac{5 ^{2} + 4.0 5 ^{2} - 3 ^{2}}{2 \cdot ( 4.05 \cdot 5 )}

解答

C = 0.64339 \dots + 2 πn, C = 2 π - 0.64339 \dots + 2 πn

+1

弧度

C = 0.64339 \dots + 6.28318 \dots n, C = 5.63978 \dots + 6.28318 \dots n

求解步骤

cos (C) = \frac{5 ^{2} + 4.0 5 ^{2} - 3 ^{2}}{2 ( 4.05 \cdot 5 )}

化简

\frac{5 ^{2} + 4.0 5 ^{2} - 3 ^{2}}{2 \cdot 4.05 \cdot 5} : \frac{32.4025}{40.5}

\frac{5 ^{2} + 4.0 5 ^{2} - 3 ^{2}}{2 \cdot 4.05 \cdot 5}

5^{2} + 4.0 5^{2} - 3^{2} = 32.4025

5^{2} + 4.0 5^{2} - 3^{2}

5^{2} = 25

= 25 + 4.0 5^{2} - 3^{2}

4.0 5^{2} = 16.4025

= 25 + 16.4025 - 3^{2}

3^{2} = 9

= 25 + 16.4025 - 9

数字相加/相减:

25 + 16.4025 - 9 = 32.4025

= 32.4025

= \frac{32.4025}{2 \cdot 5 \cdot 4.05}

数字相乘:

2 \cdot 4.05 \cdot 5 = 40.5

= \frac{32.4025}{40.5}

使用反三角函数性质

cos (C) = \frac{32.4025}{40.5}

cos (C) = \frac{32.4025}{40.5}

的通解

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

C = arccos (\frac{32.4025}{40.5}) + 2 πn, C = 2 π - arccos (\frac{32.4025}{40.5}) + 2 πn

C = arccos (\frac{32.4025}{40.5}) + 2 πn, C = 2 π - arccos (\frac{32.4025}{40.5}) + 2 πn

以小数形式表示解

C = 0.64339 \dots + 2 πn, C = 2 π - 0.64339 \dots + 2 πn

作图

流行的例子

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