【sin2(arcsin(a/c))这个三角函数怎么算啊?】
sin2(arcsin(a/c))这个三角函数怎么算啊?
sin2(arcsin(a/c))
=2sin(arcsin(a/c))cos(arcsin(a/c))
=±2a/c*√[1-(a/c)²]