Schaum's outline of precalculus حسب Safier, Fred

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

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

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

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

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

Trigonometry a worktext حسب Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach حسب Fajardo, Ira A.

Plane and spherical trigonometry حسب 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 حسب Moyer, Robert E