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We calculate the contributions of the long wavelength gravitational waves generated in the inflationary period to CMBR anisotropy quadrupole moment. We obtain the constraint lambda/(xi^2) = 1.8 X 10^(-8)/psi_i, where \"lambda\" is the self coupling, \"xi\" is the nonminimal coupling constant and \"psi_i\" means the initial value of psi = 8piG(phi^2). 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