计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
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计算sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π计算sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π计算sin5π/8*cos(7/8)π+sinπ/8-c
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
sin5π/8*cos(7/8)π+sinπ/8cos(3/8)π
=-sin3/8π*cos(1/8)π+sinπ/8cos(3/8)π
=sinπ/8cos(3/8)π-sin3/8π*cos(1/8)π
=sin(π/8-3/8π)
=sim(-π/4)=-根号下2/2
计算 sin5π/8*cos(7/8)π+sinπ/8-cos(3/8)π
sin5π/8=cosπ/8?
比较大小:sin5分之8π ( )sin5分之9π
计算下列的值(一)sin5π/2+cos²17π/3-tan²23π/6sin5π/2+cos²17π/3-tan²23π/6
计算:sinπ/12 sin5π/12
sin5/12π*cosπ/12 怎么算
SIN5/6π
(2)下列不等式中正确的是A.sin5π/7>sin4π/7 B.sin(-π/5)>sin(π/6)C.tan15π/8>tan(π/-7) D.cos(-3π/5)>cos(-9π/4)
数学极限的运算lim α→π/2 (sinα-sin5α)/(cosα+cos5α)lim(sinα-sin5α)/(cosα+cos5α)α→π/2α趋向于二分之兀.分式,分子是sinα-sin5α,分母是cosα+cos5α求结果.
sin5π/7>sin4π/7 COS(-3π/5)>COS(-9π/4) COS3π>COS7π/9 哪个正确
(sin5π/12+cos5π/12)(sinπ/12-cosπ/12)
(sin5π/12-sinπ/12)(cos5π/12+cosπ/12)=?
sin5/6π等于多少?
sin5π/4cos4π/5tan11π/6sin乘cos乘tan
(sinπ/12)-(sin5π/12)+(2sinπ/8)(sin3π/8)
sinπ/12-sin5π/12+2sinπ/8sin3π/8
sinπ /14*sin3π /14*sin5π /14答案是1/8
sin2/7π=sin5/7π?为什么