cos(A)=(1^2+5.2^2-3.5)/(2(1)(5.2))

解

cos (A) = \frac{1 ^{2} + 5. 2 ^{2} - 3.5}{2 ( 1 ) ( 5.2 )}

以下の解はない : A \in R

解答ステップ

cos (A) = \frac{1 ^{2} + 5. 2 ^{2} - 3.5}{2 ( 1 ) ( 5.2 )}

簡素化

\frac{1 ^{2} + 5. 2 ^{2} - 3.5}{2 \cdot 1 \cdot 5.2} : \frac{24.54}{10.4}

\frac{1 ^{2} + 5. 2 ^{2} - 3.5}{2 \cdot 1 \cdot 5.2}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1 + 5. 2 ^{2} - 3.5}{2 \cdot 1 \cdot 5.2}

1 + 5. 2^{2} - 3.5 = 24.54

1 + 5. 2^{2} - 3.5

5. 2^{2} = 27.04

= 1 + 27.04 - 3.5

数を足す/引く:

1 + 27.04 - 3.5 = 24.54

= 24.54

= \frac{24.54}{2 \cdot 1 \cdot 5.2}

数を乗じる:

2 \cdot 1 \cdot 5.2 = 10.4

= \frac{24.54}{10.4}

- 1 \leq cos (x) \leq 1

以下の解はない : A \in R