Schaum's outline of precalculus nork Safier, Fred

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A basic approach to precalculus trigonometry preparing to succeed in calculus nork Kim, Young H., Kim, Youngsoo, Tameru, Ana, Yan, Wen

Plane & spherical trigonometry a tetrahedron approach nork Mamhot, Millard R., Endam, Joemar C., Mamhot, Alice A., Banagua, Emelyn C., Bantug, Jenette S.

Worktext in college trigonometry nork Domingo, Alleli C., Dimasuay, Lynie B., Lawas, Vernel M., Lubag, Sharon P., Almonte, Velimor D.

Plane trigonometry nork Carpio, Joy N., Guillermo, Jaymie M.

Plane and spherical trigonometry text / workbook nork Baltazar, Ethel Cecille M., Dy, Ana Liza M., Vidar, Melvin A.

Trigonometry a worktext nork Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach nork Fajardo, Ira A.

Plane and spherical trigonometry nork Catolos, Elvira C., Feniquito, Iryne A., Amado, Ma. Victoria P., Avecilla, Leni A., Alba, Ma. Cristina S., Valderama, Julius S.

Schaum's outlines : trigonometry with calculator-based solutions nork Moyer, Robert E