求证(1-tan^4A)cos^2A+tan^2A=1
即证cos^2A-sin^2Atan^2A+tan^2A=1
即证-sin^2Atan^2A+tan^2A=sin^2A
即证-tan^2A+1/cos^2A=1
即证-sin^2A+1=cos^2A
即证cos^2A+sin^2A=1
求证(1-tan^4A)cos^2A+tan^2A=1
求证(1-tan^4A)cos^2A+tan^2A=1
..
..
数学人气:389 ℃时间:2020-04-16 17:02:08
优质解答
我来回答
类似推荐
猜你喜欢