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Dyfyniad Arddull ChicagoRaisinghania,M D, Dass,H K, and Saxena,H C. Simplified Course Trignometry: Fully Solved. New Delhi: S Chand & company ltd, 1999.
Dyfyniad MLARaisinghania,M D, et al. Simplified Course Trignometry: Fully Solved. S Chand & company ltd, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.