tan²x=2tan²β+1 求cos2x+sin²β=?

tan²x=2tan²β+1 求cos2x+sin²β=?
tan²x=2tan²β+1 求cos2x+sin²β=?

tan²x=2tan²β+1 求cos2x+sin²β=?
=tan 2;y/(tan 2;y+1) =sin 2;y 即：sin 2;y=2sin 2;x-1 慢慢想吧,我没文化