cosπ/3－tanπ/4+cosπ－sin3π/2 化简计算

Sinπ/3Tanπ/3+tanπ/6COSπ/6－Tanπ/4COSπ/2 cosπ/3－tanπ/4+cosπ－sin3π/2 化简计算 计算tan(－1560度)cos(17π/6) sin29π/6+cos(-29π/3)+tan(-25/4) cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?. cosπ|3-tanπ|4+3|4tan²π|6+cos²π|6-sinπ|4 tanα=m,则sin(α+3π)+cos(π+α)/sin(－α)-cos(π+α)等于? 化简:(sin(α-3π)*cos(-α))/(tan(α-5π)*cos^2(α-5π)*tan(4π-α)) 求值:2cosπ/2-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6+sin3π/2 -1/4cosπ 不等式证明1已知α、β、γ∈(0,π/2),且tanα+tanβ+tanγ＝3,求证：1/(cosαcosβ)+1/（cosβcosγ)+1/(cosγcosα)≥6. sin(π－a)－tan(－a)+tan(2π－a)/tan(π+a)+cos(－a)+cos(π－a) 化简计算 已知(1+tanα)(1+tanβ)=4cos（π/3）0 tan(-11π／4﹚－cos﹙-11π／4﹚的符号? sinπ+cos+(-π)+tanπ过程. tan(-2010°)+cos(-79π/6) 化简sin(π/2+α)cos(3π-α)tan(π+α)/cos(π/2-α)cos(-α-π) 化简{sin(π+α)^3cos(-α)cos(π+α)}/{tan(π+α)^3cos(-π-α)^2} 已知α∈(－π/2,0),cosα=3/5,则tan(α+π/4)等于