-3=cos(0+C)

解答

- 3 = cos (0 + C)

C \in R 无解

求解步骤

- 3 = cos (0 + C)

交换两边

cos (0 + C) = - 3

- 1 \leq cos (x) \leq 1

C \in R 无解

cos (θ) + 3 sin (\frac{θ}{2}) - 2 = 0

2 sec (θ) = 6

sin (2 x + 20) - 1 = \frac{- 1}{2}

so l v e f or x, sin (x + \frac{π}{2}) - cos^{2} (x) = 0

0 = 4 + 3 cos (θ)