化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)[2sin50°+cos10°(1+根号（3）tan10°)]/根号(1+cos10°)

求值化简：sinα*cosα 求值:sin(26π/3)+cos(-17π/4)= 化简求值:sin(π/4-3x)*cos(π/3-3x)-cos(π/6+3x)*sin(π/4+3x) 求值化简：sin^3α+cos^4α题打错了，加号后面的是cos^3α 高中三角函数化简求值化简：√2-sin^2+cos4 （根号下） cos(π/9)*cos(2π/9)*cos(3π/9)*cos(4π/9） 化简求值sin^4θ+sin^4(π/3-θ)+sin^4(π/3+θ) sin^4θ+sin^4(π/3-θ)+sin^4(π/3+θ)化简求值 化简求值sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)sin(-20/3π)cos(43/6π)+sin(35/6π)cos-(17/3π)[2sin50°+cos10°(1+根号（3）tan10°)]/根号(1+cos10°) 化简求值cos190*sin(-210)/cos(-350)*tan(-585) 求值： 2(sin^6 θ+cos^6 θ)-3(sin^4 θ+cos^4 θ) 怎样化简函数 cosπ/4cosπ/3-sinπ/4sinπ/3cosπ/4cosπ/3-sinπ/4sinπ/3 求值:sin(-31π/6)-cos(-10π/3)-sin11π/4 求值：sin(π/12)+cos(π/12) 高一三角函数 化简求值[sin(7π/2+a)*cos(a-π)*sin^2 (a+2π)]/[cos(3/2+π)*tan(π+a)*cos^3(-a-π)] sin(-150°)cos(-210°)cos(-420°)/cos(-600°)sin(-1050°)化简求值。 求值【sin(2π-α)sin(π+α)cos(-π-α)】/【sin(3π-α)-cos(π-α)】 sin(-π/4)求值 化简求值cos(π/7)cos(2π/7)cos(4π/7)