sin40 tan10 ¸ùºÅ3
Çósin40¡ã(tan10¡ã¡ª¸ù3)µÄÖµ
¡Ì3=tan60Ôʽ=sin40(sin10/cos10-sin60/cos60)=sin40(sin10cos60-cos10sin60)/cos10cos60=sin40sin(10-60)/cos10cos...
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¼ÆËã:1¡¢sin40*(tan10 - ¡Ì3)µÃ¶àÉÙ?
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tan40¶È cos50¶È sin10¶È ¸ùºÅ3±¶µÄcos10 ·Ö±ðµÈÓÚ¶àÉÙ - °Ù¶È...
tan40=0.839 cos50=0.643 sin10=0.174 ¸ùºÅ3±¶cos10=0.9959
...sin40¡ã(tan10¡ã - ¡Ì3)ÔõÑù½â ×¢Ã÷:¡Ì3 ÊÇ3¿ª¸ùºÅµÄ...
=sin40*cos80/2sin40*cos40-¸ùºÅ3*sin40 =(1/2)*cos80/cos40-¸ùºÅ3*sin40 =[(1/2)*cos80-¸ùºÅ3sin40*sin40]/cos...
Çósin4o¶È(tan10¶È - ¸ùºÅ3)µÄÖµ
Ôʽ=((sin10/cos10)-¡Ì3(cos10/cos10))*sin40 = 2£¨1/2*sin10-¡Ì3/2*cos10£©/cos10 *sin40 =2 sin(10-60)...
(tan10¡ã - ¸ù3)sin40¡ã
(tan10¡ã-¸ùºÅ3)¡Ásin40¡ã =(sin10¶È/cos10¶È-sin60¶È/cos60¶È)*sin40¶È =(sin10¶Ècos60¶È-sin60¶Ècos10¶È)*sin40¶È...
»¯¼ò:sin40¡ã(tan10¡ã?3)=
10¡ã?60¡ã)cos10¡ã=?2sin40¡ãsin50¡ãcos10¡ã=?sin40¡ãcos40¡ãcos10¡ã¡Á2=-sin80¡ãcos10¡ã=-1¹Ê´ð°¸Îª£º-1 ...
(tan10 - ¸ùºÅ3)³Ësin40=?
£¨tan10-¸ùºÅ3£©³Ësin40=-1
(tan10 - ¸ùºÅ3)sin40=?
(tan10-¸ùºÅ3)sin40 =sin40¶È*(1/2*sin10¶È-¸ùºÅ(3)*cos10¶È/2)/(1/2*cos10¶È)=2sin40¶È*sin(10-60)¶È/ cos10...