Cosx = - √ 3 / 3, and 180 is less than x, less than 270 ° the process of calculating sin2x, cos2x, tan2x is required

Cosx = - √ 3 / 3, and 180 is less than x, less than 270 ° the process of calculating sin2x, cos2x, tan2x is required

sin2x=2√2/3
cos2x=-1/3
tan2x=-2√2