cos(30+x)=276

解答

cos (3 0^{\circ} + x) = 276

x \in R 无解

求解步骤

cos (3 0^{\circ} + x) = 276

- 1 \leq cos (x) \leq 1

x \in R 无解

3 sin (2 x) + cos (2 x) = 2 cos (2 x)

sin (x) = - sin (x) cos (x)

tan^{2} (\frac{x}{2}) = 1

cos (x) + sin^{2} (x) - cos^{2} (x) = 0

1 - sin (x - \frac{3 π}{2}) = - sin (x - \frac{π}{2})