π*0.75^2*1.3/(4/3)*π*0.025^3

π*0.75^2*1.3/(4/3)*π*0.025^3 2π-3π/4等于多少 计算sin^2 (π/4)-cos^2 (π/4) * cosπ+3/4π^2 (π/6)+sin3π/2 cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?. Sinπ/3Tanπ/3+tanπ/6COSπ/6－Tanπ/4COSπ/2 23/4π=7π+2/3π怎么知道7π+2/3π,还有21/8π=2π+5/8π, tanx不是1/4π+2kπ，3/4π+2kπ么~为什么 化简sin(nπ+2π/3)×cos(nπ+4π/3) n属于Z 求值:2cosπ/2-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6+sin3π/2 -1/4cosπ 比较下列两组书中两个实数的大小1.3根号3和4根号22.-2根号10和-2π 计算cos5分之π+cos5分之2π+cos5分之3π+cos5分之4π 计算cos5分之π+cos5分之2π+cos5分之3π+cos5分之4π cosπ/3－tanπ/4+cosπ－sin3π/2 化简计算 cos9/π.cos9/2π.cos9/3π.cos9/4π等于多少! 计算：cos（π/5)+cos（2π/5)+cos(3π/5)+cos(4π/5) |π-3|+|π-4|咋么算 填表（有关高中数学必修四任意角的三角函数）角a 0 π/6 π/4 π/3 π/2 π 3π/2 2πsinacosatana 化简 cot(a+4π)cos(a+π)[sin(a+3π)]^2/tan(π+a)[cos(-π-a)]^2