求sin100°+tan240°*cos100°的值
问题描述:
求sin100°+tan240°*cos100°的值
答
sin100°+ tan240°*cos100° = sin100° + tan60°*cos100° = sin100° + sqrt(3) * cos100° = 2 [0.5 *sin100° + sqrt(3) / 2 * cos100°] = 2 * sin(100 + 60) = 2 * sin(160).The end