sin(-150°)cos(-210°)cos(-420°)/cos(-600°)sin(-1050°)化简求值。

sin(-150°)cos(-210°)cos(-420°)/cos(-600°)sin(-1050°)化简求值。 tan(-150°)cos(-210°)cos(-420°)tan(-600°)/sin(-1050°) sin平方150°＋sin平方135°-2sin平方210°＋cos平方225°=? cos(150°-a)+sin(a-105°)=? 化简cos(α+30°)cos(α-30°)-sin(α+30°)sin(α+150°),化简cos(α+30°)cos(α-30°)-sin(α+30°)sin(α+150°)， 求2sin(-1110°)-sin960°+根号2cos(-225°)-cos(-210°) tan(-150°)cos(-570°)cos(-1140°)/cot(-240°)sin（-690°) 求sin 135°+cos平方 150°+2sin210°cos平方 225° sin平方120°+cos180°+tan45°-cos平方(-330°)+sin(-210°) 计算：sin（3π /4 ) +cos (2π /3) - sin 150° + cos135°=? sin(10°)+sin(20°)cos(50°)求值 cos^15°-sin^15°= sin(α+30°)-sin(α-30°)/cosα sin^2 30°+cos()=1 计算：sin^67.5°-cos^67.5度 sin²15° 把sin变成带cos的 计算cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6[tan(-150°)cos（-210°）cos420°]/cot(-600°)sin（-1050°）cos25/6π+cos25/3π+tan(-25/4π)5sinπ/2+2cos0-3sin3/2π+10cosπtan10°t 计算（1）cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6[tan(-150°)cos（-210°）cos420°]/cot(-600°)sin（-1050°）cos25/6π+cos25/3π+tan(-25/4π)5sinπ/2+2cos0-3sin3/2π+10cosπt