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֪Rc

2020ДWǺ

JǽA(sin),(cos)(tan),(cot)Լ(sec)(csc)AJǺ (sin)߅б߅sinA=a/c (cos)߅б߅cosA=b/c (tan)߅߅t

2020-05-24

2020ДWǺʽȫ

ǺͲeʽ sin +sin =2sin[( + )/2]cos[( - )/2] sin -sin =2cos[( + )/2]sin[( - )/2] cos +cos =2cos[( + )/2]cos[( - )/2] cos -cos =-2sin[( + )/2]sin[( - )/2] ǺeͲʽ

2020-05-24

ДWǺ֪RcR

пWPڳДWǺ֪RcRϣͬWH ̖ Ԕ 1 2020пW֪RcǺͲeʽ c鿴 2 2020пW֪RcǺeͲʽ c

2019-10-29

2020пW֪RcǺͲeʽ

sin +sin =2sin[( + )/2]cos[( - )/2] sin -sin =2cos[( + )/2]sin[( - )/2] cos +cos =2cos[( + )/2]cos[( - )/2] cos -cos =-2sin[( + )/2]sin[( - )/2] ³ߴaPע пW΢Ź̖ ÿ

2019-10-06

2020пW֪RcǺeͲʽ

sin cos =(1/2)[sin( + )+sin( - )] cos sin =(1/2)[sin( + )-sin( - )] cos cos =(1/2)[cos( + )+cos( - )] ³ߴaPע пW΢Ź̖ ÿ͌WW֪Rc ӭ2020п

2019-10-06

2020пW֪RcǺfܹʽ

sin =2tan( /2)/[1+tan^2( /2)] cos =[1-tan^2( /2)]/[1+tan^2( /2)] tan =2tan( /2)/[1-tan^2( /2)] ³ߴaPע пW΢Ź̖ ÿ͌WW֪Rc ӭ2020п

2019-10-06

2020пW֪RcǺǹʽ

sin^2( /2)=(1-cos )/2 cos^2( /2)=(1+cos )/2 tan^2( /2)=(1-cos )/(1+cos ) tan( /2)=sin /(1+cos )=(1-cos )/sin ³ߴaPע пW΢Ź̖ ÿ͌WW֪Rc ӭ2020

2019-10-06

2020пW֪RcǺǹʽ

sin3 =3sin -4sin^3( ) cos3 =4cos^3( )-3cos ³ߴaPע пW΢Ź̖ ÿ͌WW֪Rc ӭ2020п

2019-10-06

2020пW֪RcǺǹʽ

sin(2 )=2sin cos cos(2 )=cos^2( )-sin^2( )=2cos^2( )-1=1-2sin^2( ) tan(2 )=2tan /[1-tan^2( )] ³ߴaPע пW΢Ź̖ ÿ͌WW֪Rc ӭ2020п

2019-10-06

2020пW֪RcǺɽǺcʽ

cos( + )=cos cos -sin sin cos( - )=cos cos +sin sin sin( )=sin cos cos sin tan( + )=(tan +tan )/(1-tan tan ) tan( - )=(tan -tan )/(1+tan tan ) ³ߴaPע пW΢Ź̖ ÿ

2019-10-06

ДW֪RcǺҪ֪RcY

1ɶֱ΃ֱ߅abƽ͵б߅cƽa2+b2=c2 2ˆDRtABC Cֱt AJǺ( AɓQ B) 3JǵֵǵֵJǵֵ

2019-10-06

пWYϣǹʽƌ

пWYϣǹʽƌ tan3 =sin3 /cos3 =(sin2 cos +cos2 sin )/(cos2 cos -sin2 sin ) =(2sin cos^2( )+cos^2( )sin -sin^3( ))/(cos^3( )-cos sin^2( )-2sin^2( )cos ) ͬcos^3( )ã t

2019-05-30

пW֪Roҵ|

пW֪Roҵ| κһ߅ƽ߅ƽĺ͜pȥ@߅cAǵҵăɱe߅abcǞABCtM| a^2=b^2+c^2-2 b c cosA b^2=a^2+c^2-2 a c c

2019-05-30

пWǰoͲeʽƌ

пWǰoͲeʽƌ Ͳeʽƌ ҂֪sin(a+b)=sina*cosb+cosa*sinbsin(a-b)=sina*cosb-cosa*sinb ҂уʽӾ͵õsin(a+b)+sin(a-b)=2sina*cosb sina*cosb=(sin(a+b)

2019-05-30

пWoǺTʽ

пWoǺTʽ Tʽı| ^ǺTʽnjn ( /2) ǺD Ǻ õTʽ ʽһO K߅ͬĽǵͬһǺֵȣ sin(2k

2019-05-30

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