Cho x, y là các số nguyên dương thoả mãn: (x+y)^2+6x+2y+4 là 1 số chính phương. Chứng minh rằng: x=y

Find csc x if sin x + cot x cos x =√3 a. 9 b. 3 c. √(3)/2 d. √(3)

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days