化简sin^2asin^2b+cos^2acos^2b-1/2(cos2acos2b)=感觉这题有点怪啊
问题描述:
化简sin^2asin^2b+cos^2acos^2b-1/2(cos2acos2b)=
感觉这题有点怪啊
答
化简sin^2asin^2b+cos^2acos^2b-1/2(cos2acos2b)=
感觉这题有点怪啊