Schaum's outline of precalculus 由 Safier, Fred

Available for University of the Philippines Diliman via McGraw-Hill Access Engineering. Click here to access
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A basic approach to precalculus trigonometry preparing to succeed in calculus 由 Kim, Young H., Kim, Youngsoo, Tameru, Ana, Yan, Wen

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

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

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

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

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

Trigonometry a worktext 由 Calingasan, Recto Rex M.

Spherical trigonometry a comprehensive approach 由 Fajardo, Ira A.

Solved problems in trigonometry 由 Cabero, Jonathan B.