cos(-585°)/sin630°+sin( -690°)
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cos(-585°)/sin630°+sin(-690°)cos(-585°)/sin630°+sin(-690°)cos(-585°)/sin630°+sin(-690°)cos(-585°)/si
cos(-585°)/sin630°+sin( -690°)
cos(-585°)/sin630°+sin( -690°)
cos(-585°)/sin630°+sin( -690°)
cos(-585°)/sin630°+sin( -690°)
=cos(720°-585°)/sin(720°-90°)+sin(720° -690°)
=cos135°/(-sin90°)+sin30°
=cos(180°-45°)/(-sin90°)+sin30°
=-cos45°/(-sin90°)+sin30°
=cos45°/sin90°+sin30°
=√2/2+1/2
cos(-585°)/sin630°+sin( -690°)
计算:2cos(-660°)-sin630°/4cos1020°+2cos(-300°)
化简:cos^21°+cos^22°+cos^23°.+cos^289°要详细过程
cos-30°是多少?
cos 9.85°=?
Cos(-60°)=?
cos 60°是多少
cos²1+cos²2+cos²1°+cos²2°+.+cos²89°
4sin15°×2cos 15°×cos 60°
化简:cos(60°-a)-cos(60°+a)=
化简 cos²20°+cos²70°
cos²80°+cos²10°=?
cosx+cos(120°-x)+cos(120°+x)
化简:cos(60°+a)-cos(60°-a)
化简cos(80°)/1-cos(10°) =
计算:cos²55°+cos²35°
cos(60°+a)+cos(60°-a)
cos(60°-a)-cos(60°+a)=