The value of
`(alpha^3)/2cos e c^2(1/2tan^(-1)alpha/beta)+(beta^3)/2sec^2(1/2tan^(-1)(beta/alpha))i se q u a lto`
`(alpha+beta)(alpha^2+beta^2)`
(b) `(alpha+beta)(alpha^2-beta^2)`
`(alpha+beta)(alpha^2+beta^2)`
(d) none of these
A. `(alpha - beta) (alpha^(2) + beta^(2))`
B. `(alpha + beta) (alpha^(2) - beta^(2))`
C. `(alpha + beta) (alpha^(2) + beta^(2))`
D. none of these