Schaum's outline of precalculus av Safier, Fred

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

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

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

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

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

Trigonometry a worktext av Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach av Fajardo, Ira A.

Plane and spherical trigonometry av 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 av Moyer, Robert E