sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
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sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
=sin120°cos30°+cos60°sin30°+tan135°
=sin60°cos30°+cos60°sin30°+(-tan45°)
=sin(60°+30°)-tan45°
=sin90°-tan45°
=1-1
=0
sin(-1320°)cos1110°的值
sin(-1320°)、cos1110°、cos(-1020°)、sin750°、tan495°等于多少
sin(-1320°)cos1110°+cos(-1020°)sin750°+tan495°
求值 sin(-1320°)cos1110°+cos(-1020°)sin750°+cos495°
化简:sin780°cos1110°+cos(-660°)sin(-690°)+tan585°cos1440°
计算不太明白...求值sin(-1320°)*cos1110°+cos(-1020°)sin750°+tan(-405°)求值sin25π/6+cos25π/3+tan25π/4+sin7π/3*cos13π/6-cos5π/3
求sin(-1320)cos1110+cos(-1020)sin750的值
sin(-1320)cos1110+cos(-1020)sin750+tan495的值.
sin-1320度cos1110度+cos-1020度sin750度+tan495度=?
sin(-1395)cos1110+cos(-1020)sin750
问一道数学题 sin(-1320)乘以cos1110+cos(-1020)乘以sin720,最后再加上tan495,等于?
求值:sin(-1350)cos1110+cos(-1020)sin750+tan405
sin(-1380`)cos1110`+ cos(-1020`)sin750`+tan495`求过程
化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
sin(-1300°)等于多少?sin(-1300)=-sin(1300)=-sin(360*4-140)=-sin(-140)=sin(140)=sin(90+50)=cos50 这个是我的计算步骤 有错吗 在哪里 请指教
sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) =
高一数学化简sin(-1071°)*sin99°+sin(-171°)*sin(-261°)
化简:sin方(a-30°)+sin方(a+30°)—sin方a