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受欢迎的三角函数 >

cos(A)=(4^2+(5.1)^2-3^2)/(2-4*5.1)

解答

cos (A) = \frac{4 ^{2} + ( 5.1 ) ^{2} - 3 ^{2}}{2 - 4 \cdot 5.1}

解答

A \in R 无解

求解步骤

cos (A) = \frac{4 ^{2} + ( 5.1 ) ^{2} - 3 ^{2}}{2 - 4 \cdot 5.1}

化简

\frac{4 ^{2} + 5. 1 ^{2} - 3 ^{2}}{2 - 4 \cdot 5.1} : - \frac{33.01}{18.4}

\frac{4 ^{2} + 5. 1 ^{2} - 3 ^{2}}{2 - 4 \cdot 5.1}

4^{2} + 5. 1^{2} - 3^{2} = 33.01

4^{2} + 5. 1^{2} - 3^{2}

4^{2} = 16

= 16 + 5. 1^{2} - 3^{2}

5. 1^{2} = 26.01

= 16 + 26.01 - 3^{2}

3^{2} = 9

= 16 + 26.01 - 9

数字相加/相减:

16 + 26.01 - 9 = 33.01

= 33.01

= \frac{33.01}{2 - 4 \cdot 5.1}

2 - 4 \cdot 5.1 = - 18.4

2 - 4 \cdot 5.1

数字相乘:

4 \cdot 5.1 = 20.4

= 2 - 20.4

数字相减:

2 - 20.4 = - 18.4

= - 18.4

= \frac{33.01}{- 18.4}

使用分式法则:

\frac{a}{- b} = - \frac{a}{b}

= - \frac{33.01}{18.4}

- 1 \leq cos (x) \leq 1

A \in R 无解

作图

流行的例子

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