cos0,cos（π/3),cos(π/2);各等于多少?说明其原因.

cos0,cos（π/3),cos(π/2);各等于多少?说明其原因. cosπ/3-sin平方π/4cosπ-1/3tan平方π/3-sin3π/2+cos0的值 计算4tan²π/4-cos²π/3-1/2sin²π/6+sinπ/2*cos0的值 高一三角函数简单计算5sin（π/2）+2cos0-3sin（3π/2）+10cosπ请列出详细解题步骤. 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 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 特殊角函数值有什么计算方法吗?cos 82.8；cos42.3；cos0.725；cos 0.9086等于多少度? cos^3(-π-α) 计算：cos（π/5)+cos（2π/5)+cos(3π/5)+cos(4π/5) 已知α∈(π/2,π)且sin0.5α+cos0.5α=根号6/2.一,求cosα的值（已求出为负的根号3/2）二,sin(α-...已知α∈(π/2,π)且sin0.5α+cos0.5α=根号6/2.一,求cosα的值（已求出为负的根号3/2）二,sin(α-β)=-3/5,β∈(π/2, cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简 求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11) 求值：cos(π/11)-cos(2π/11)+cos(3π/11)-cos(4π/11)+cos(5π/11) cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11) 高一三角函数计算如题 ①2sin0°+5sin90°-3sin270°+10sin180° ②sinπ/6-√2sinπ/4+4/3sinπ/3+sinπ/6+sin3π/2 ③cos0°+5sin90°-3sin270°+10cos180° ④cosπ/3-tanπ/4+3/4tanπ/6-sinπ/6+cosπ/6+sin3π/2 ⑤sin四次方π/4-cosπ/2+6tan cos（π/3+x）+cos（π/3-x） 化简cos(1-π)+cos(3π+1)= COS多少等于π／3?