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受欢迎的三角函数 >

cos^2(x)= 3/2

解答

cos^{2} (x) = \frac{3}{2}

解答

x \in R 无解

求解步骤

cos^{2} (x) = \frac{3}{2}

用替代法求解

cos^{2} (x) = \frac{3}{2}

令

: cos (x) = u

u^{2} = \frac{3}{2}

u^{2} = \frac{3}{2} : u = \frac{3}{2}, u = - \frac{3}{2}

u^{2} = \frac{3}{2}

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

u = \frac{3}{2}, u = - \frac{3}{2}

u = cos (x)

代回

cos (x) = \frac{3}{2}, cos (x) = - \frac{3}{2}

cos (x) = \frac{3}{2}, cos (x) = - \frac{3}{2}

cos (x) = \frac{3}{2} :

无解

cos (x) = \frac{3}{2}

- 1 \leq cos (x) \leq 1

无解

cos (x) = - \frac{3}{2} :

无解

cos (x) = - \frac{3}{2}

- 1 \leq cos (x) \leq 1

无解

合并所有解

x \in R 无解

作图

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14 4^{2} = 43.2 7^{2} + 7 2^{2} - 2 \cdot 43.27 \cdot 72 \cdot cos (x)

sin(8x+48)=cos(-4x+26)

sin (8 x + 48) = cos (- 4 x + 26)

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