这个怎么解要过程,谢谢啦!
1个回答
2019-10-05
展开全部
过程,先提取根号2.
cos2x+sin2x
=√2(√2/2*cos2x+√2/2*sin2x)
=√2(cos(pi/4)cos2x+sin(pi/4)sin2x)
=√2 cos(2x-pi/4)
或者=√2(sin(pi/4)cos2x+cos(pi/4)sin2x)=√2sin(2x+pi/4)
cos2x+sin2x
=√2(√2/2*cos2x+√2/2*sin2x)
=√2(cos(pi/4)cos2x+sin(pi/4)sin2x)
=√2 cos(2x-pi/4)
或者=√2(sin(pi/4)cos2x+cos(pi/4)sin2x)=√2sin(2x+pi/4)
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询