Verify the following: [(-2) + (-9)] + 6 = (-2) + [(-9) + 6]

Find the derivatives of the following : tan^(-1) ((6x)/(1-9x^2))

Solve the following equation 4x + 4.9 = 6.5

Find the derivatives of the following : tan^(-1)((6x)/(1-9x^(2)))

Find the degree of the following polynomials. 3x^(4) + 9x^(2) + 27x^(6)

Multiple the following polynomials and find the degree of the resultant polynomials ? p(x) = x^(2) - 9 q(x) = 6x^(2) + 7x-2