L
leductien1900


chet rui ko bit' bam' tich phan mieu ta so xo cac ban giup minh nha
tp: (c o s 2x)
căn (sin^2 + 4*cos^2))
tim giup minh cai nguyen ham! chi cho minh cach bam' tp voi nhe! thank you:-SS
tp: (c o s 2x)
tim giup minh cai nguyen ham! chi cho minh cach bam' tp voi nhe! thank you:-SS