Schaum's outline of precalculus de réir Safier, Fred

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

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

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

Plane trigonometry de réir Carpio, Joy N., Guillermo, Jaymie M.

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

Trigonometry a worktext de réir Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach de réir Fajardo, Ira A.

Plane and spherical trigonometry de réir 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 de réir Moyer, Robert E