及時(shí)正弦、余弦函數(shù)的圖象(留存版)
【正文】 i n (),23,(,43c o s),2(,32s i 的值求已知例????????????????12356)s i n ( ???? ??)6s i n (2)s i n (3)c os (:.2 ??????? ??????求證例)2s i n (2)]s i n (6c os)c os (6[ s i n2)]s i n (23)c os (21[2:???????????????????????????分析.2s i n,2s i n,53)s i n (,1312)c o s (,432.3的值求已知例?????????? ????????,40,23),()(2),()(2:?????????????????????????????????分析.65162s i n,6556135)54(131253)]()s i n [ (2s i n????????????????????同理得能力訓(xùn)練題 167。 、余弦、正切 (3) .15t a n)1(。,)2(。s i n)6(。32)1.(5 ??.1)2(。)s i n ()1(????????????????????????????????????????BBABBABA167。 、余弦、正切 (3) 。3)1.(6?315t a n45t a n1 15t a n45t a n15t a n1 15t a n1,45t a n1, ?? ?????? ????????分析.)tan (,tan,tan)0( 2的值求的兩個(gè)根為且已知一元二次方程例???? ?????? caacbxax????
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