sin(35°-a)=12/13,则cos(a+55°）=?作业写不完了 发动群众

若sin(125°-a)=12/13,则sin(a+55°)=? 已知平面向量a=(cosα,sinα),b=(cosβ,sinβ),若a=入b,则实数入的值为?=co, 若sin(125°-a)=12/13,则cos(a-35°)=? sin(35°-a)=12/13,则cos(a+55°）=?作业写不完了 发动群众 非线性方程解析解-x0*cos(b)*cos(c)-y0*(-sin(a)*cos(b)*cos(c)-cos(a)*sin(c))-z0*(-cos(a)*cos(b)*cos(c)+sin(a)*sin(c))=0-x0*cos(b)*sin(c)-y0*(-sin(a)*cos(b)*sin(c)+cos(a)*cos(c))-z0*(-cos(a)*cos(b)*sin(c)-sin(a)*cos(c))=0 -x0*cos(b)-y0*sin(a)*co 如果sin(125度-a)=12/13,那么sin(a+45度)=? sin(a+b)cosa-cos(a+b)sina=5/13 则sin（π-B)=? sin a=0.4 则sin(π-a)=? sin(a+360°)=? cos(pi/4-a)=12/13,pi/4-a是第一象限角,则sin(pi/2-2a)/sin(pi/4+a)的值是 已知a,b属于(3π/4,π),sin(a+b)=-3/5,sin(b-π/4)=12/13,则cos(a+4/π)= 已知a,b属于(3pai/4,pai),sin(a+b)=-3/5,sin(b-pai/4)=12/13则cos(a+pai/4)=多少 a,b∈（3pi/4,pi）,sin(a+b)=-3/5,sin(b-pi/4)=12/13,则cos（a+pi/4）= 已知a,b,属于（3pi/4,pi),sin(a+b)=-3/5,sin(b-pi/4)=12/13,则cos(a+pi/4)=? sin(π/4-a)=3/5,sin(π/4+b)=12/13,其中0 一个简单的三角函数题(sin a + cos a)/(sin a - cos a) 则 sin a *cos a=(sin a + cos a)/(sin a - cos a) = 2 则 sin a *cos a= 已知a是钝角,且sin(a+20°）=1/3,则sin(a+65°）= sin²a+sin²75°=1,且a为锐角,则a=_______