课时达标检测(二十二)三角恒等变换[练基础小题——强化运算能力]1.[2sin50°+sin10°(1+tan10°)]·=________.解析:原式=·sin80°=·cos10°=2[sin50°·cos10°+sin10°·cos(60°-10°)]=2sin(50°+10°)=2×=.答案:2.已知sin=,-<α<0...
时间:2024-11-17 16:09栏目:中学教育