1.4 正弦函数和余弦函数的定义与诱导公式（同步讲义）-【创新方案·高中同步创新课堂】2020-2021学年高中数学必修4（北师大版）

!"#$%& !"#!$%&' !"!!"#$ !()*!!!+,-." $#/012"3456 "!$"%"!$#%"!$$%"!#!%!$!& '!!"# !789!!!:;<=" >?" !!@A"!$&$"%!"& $#%#"$$%%'&''()*+,-./ 01#()$##%$$*$+%! !BCDE"!$&$"%23"!"! $#%423"5678'9:;<=,>? ?@ %$",-%'A B C D E 8 F < = , G H'IJ'ABKLMNOP,! >?F !!@A"! $&&Q*R9$*ST U)V''Q*RUW,LM%$$*$ST%! X9)YLM-Z[\'."*/'*$]%'̂ "0Y_>`ab$#YLM'Ic^"0Y_ >`-Zb'*.$#/"#(*$]%[\! !BCDE"!%&' >?$ !!@A"! $&d _ e 4 3 ( f g h':;ijkl) mn-o3 *'#pq )rmnijkl,>?1*!,s'IJ# ( 3q)rmn * 3,>?1"s'# * ftWmijklKqurmnijkl' v>*!,s'mn ( 3v>*!,s'43 ( wrnmijkl)'xqyrmnijk lXv>*!,s!zqyr:;ijkl, >?1"1*!,1*!,1*!,/#!,$s%! !BCDE"!"!#(!#!)* !#!%&'(&)*! !()*!!!+,-." F#GHIJ"KLMN "!$"%!+,-!./!01 $#%234!534!6789:;< #!=/!+ >?@AB>!CDEFG $!!,-"$0*2!HG?IJK $#/012"3456 "!$"%"!$#%"!$$%"!$'%"!#!&!$!& '!#,*2!#""*2 !789!!!:;<=" >?" !!@A"!$L& {| }~ �IS� " " ��<=,�Y�)�< 0$0*2, � G �'� � � �� # " !K� �'x *2#!#3*2' z(!$*2#!#3*2)% ($$ *2&$#3*2) MN {| }~ �IS� % " qu����)��K� �'! #$**2K q u � � �'���K�� & " ������_p3*2'� ���K�� ' " 3*2, � � � K q ) � � �'��Kqu���'z '�}� OP&#& !BCDE"!"!%!#!4 >?F !!@A"!$&!O"!PQO"! �#,2��� < = , � , � � 1 .$ ($$$ $-!$0*2,#,2'-'!)! �-$ #$'� b $$ #$.$0*2,#,2$ #"*,,2' �¡¢* �-$ ##'� b $$ ##.$0*2,#,2$ #03,2' �¡¢* �-$ #"'� b $$ #".$0*2,#,2$ #$$,2'� �¡¢* z �¡¢,�b#"*,,2'#03,2! !OF!RSTUO"!�#,2���<=,� ,��1.$($$$$-!$0*2,#,2'-'!)! £ � ¤ ¥ #" *(*2&-!$0*2,#,2# #$0*2'¦#$ , 5#& -##" , 5# ! X&-'!''-$#$§-$##! ¨-$#$>'$$#"*,,2* ¨-$##>'$$#03,2' z �¡¢,�b#"*,,2'#03,2! !BCDE"!$"%!$#,*2,$#0%"$0*2 CQEFG!$#%#""*2'#'5*2 >?$ !!@ A"! $&$"%� � © ^ ª « )( ¬,�,��1 /$(!$!$',2,-!$0*2'-'!)! $#%��©^ª«)( �­®¯«¬,�, ��10$(!$!$##,2,-!$0*2'-'!)' ���©^°«)( ¬,�,��1 /(0$(!$!$',2,-!$0*2'-'!)((!$! $##,2,-!$0*2'-'!) $(!$!$',2,#-!"(*2'-'!)((!$! $',2,$#-,"%!"(*2'-'!) $(!$!$',2,1!"(*2'1'!)! $$%=±'¦��©^°« )* ¬,�,� �1($$$$0*2,1!"(*2'1'!)'z��© ^²³´µ `$¶ � ·%, � , � � 1 (!$ ',2,1!"(*2&!&0*2,1!"(*2'1'!)! !BCDE"!$"%R*S,- )/ T?G?U VW(!$!$#"*2,-"$0*2'-'!) R*S,-)0 T?G?UVW (!$!$$**2,-"$0*2'-'!) $#%R*SXYZ[$\*]%G?UVW (!$#"*2,-"$0*2&!&$**2,-"$0*2'-'!) !$!+,-! !()*!!!+,-." F#GHI