TY - BOOK AU - Foerster, Paul A. TI - Trigonometry : functions and applications ET - 2nd ed PB - Addison-Wesley PY - 1984 T2 - Addison-Wesley innovative series EP - 390 p. UR - https://ci.nii.ac.jp/ncid/BA22817153 SN - 0201202379 SN - 0201201003 ER -