sin10°cos35°+cos10°cos55°=
不查表求cos80°cos35°+cos10°cos55°的值.
化简求值2sin50°+cos10°(1+3tan10°)cos35°cos40°+cos50°cos55°
cos20°cos10°+sin10°sin10°
化简sin10°-根号3*cos10°
1/sin10°-根号3/cos10°=
1、求证:cos40°(cos10°+√3 sin10°)=cos10°
sin40°cos10°-cos40°sin10°
(2cos70°+根号3sin10°)/cos10°
(cos10°-根号3sin10°)/sin20°
化简:根号(1+2sin10°cos10°)
化简:1/(sin10°) —根号3/cos10°
求1/sin10°-根号3/cos10°的值.