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lovibond: ½ð±Ò+1, ¸Ðлר¼Ò½â´ð 2012-12-12 16:16:52
Pythagorean trigonometric identity.

1+tan^2x=1/cos^2x

sin^2x+cos^2x=1
2Â¥2012-12-12 02:37:53
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lovibond: ½ð±Ò+1, ¹ÄÀøÓ¦Öú 2012-12-12 16:16:30
1225635043: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú 2012-12-12 21:33:07
Â¥Ö÷¿Éͨ¹ý»­Èý½ÇÐνøÐмÆË㣬·Öĸ×ÜÊÇÉ趨Ϊ1.
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ÔÙ±ÈÈçtan(arcsinx)£¬±íʾsin(alpha)=x£¬Ôò¶Ô±ßΪx£¬Ð±±ßΪ1£¬ÔòÁÚ±ßΪsqrt(1-x^2)¡£tan±íʾ¶Ô±ß±ÈÁڱߣ¬¹Êtan(arcsinx)=x/sqrt(1-x^2)¡£
ÀàËÆ¿ÉµÃ£ºcos(arctanx)=1/sqrt(1+x^2)¡£tan(arccosx)=sqrt(1-x^2)/x¡£
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3Â¥2012-12-12 06:21:41
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lovibond: ½ð±Ò+1, ¹ÄÀøÐ³淢Ìû 2012-12-12 16:16:40
tan(arcsinx)=sin(arcsinx)/cos(arcsinx)=x/¡Ì(1-x^2)
3.sin(arctanx)=tan(arctanx)cos(arctanx)=tan(arctanx)/sec(arctanx)ÒòΪsecxÔÚ(-¦Ð/2,¦Ð/2)ÉÏÊÇÕýµÄ=tan(arctanx)/¡Ì[1+tan^2(arctanx)]=x/¡Ì(1+x^2)
4Â¥2012-12-12 14:20:37
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