Schaum's outline of precalculus di Safier, Fred

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

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

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

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

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

Trigonometry a worktext di Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach di Fajardo, Ira A.

Plane and spherical trigonometry di 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 di Moyer, Robert E