(11)/(cos(90))=(10)/(cos(x))

解答

\frac{11}{cos ( 9 0 ^{\circ} )} = \frac{10}{cos ( x )}

x \in R 无解

求解步骤

\frac{11}{cos ( 9 0 ^{\circ} )} = \frac{10}{cos ( x )}

cos (\frac{π}{2}) = 0

\frac{11}{0}

\frac{x}{0}

不在定义域

x \in R 无解

tan^{2} (x) = cot^{2} (x)

so l v e f or x, cos (\frac{x}{2}) = - cos (2 x - 30)

1 - cos (x) = \frac{1}{2 sin ^{2} ( x )}

cos (2 x - 1) = \frac{1}{2}

tan (a) = \frac{5}{3}