化简:sin315°sin(-1260°)+cos570°sin(-840°)
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化简:sin315°sin(-1260°)+cos570°sin(-840°)
sin315°等于多少?
(cos(-570°)cos120°sin315°)/sin(-1050°)=?
计算:sin315°-sin(-480°)+cos(-330°)
sin 225度会不会等于sin315度
1)sin5π/12sinπ/12的值是2)sin315°sin(-1260°)+cos570°sin(-840°)=?3)已知sin(π/2+a)=-4/5,a∈(π,3π/2),则cos(π/3-a)的值为?
求cos15°*cos225°的绝对值-sin315°*cos105°的绝对值的值是多少
sin315等于?
化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
化简sin(60°+α)-sin(60°-α)急用.
sin(30°+β)-sin(30°-β)化简
化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
sin²1°+sin²2°+sin²3°+...+sin²89°化简
sin(10°)+sin(50°)-sin(70°) =sin(10°)+sin(50°)-sin(70°) =
sin315度- cos135度+2sin570度=
sin315度- cos135度+2sin70度=
化简:sin(-1071°)*sin99°+sin(-171°)*sin(-261°)+tan1089°*tan(-540°)RT