yamseng
2013-8-22 09:45 PM
谁会解这题
simplify the following expression
a) (tan^2 x+cos^2 x) / (sin x +sec x)
ans: sec x - sin x
b) (cos^4 x -sin^4 x) / (cos x - sin x)
ans: cos x + sin x
show the steps please
都快要被math 折磨死了
simplify the following expression
a) (tan^2 x+cos^2 x) / (sin x +sec x)
ans: sec x - sin x
b) (cos^4 x -sin^4 x) / (cos x - sin x)
ans: cos x + sin x
show the steps please
都快要被math 折磨死了
