a / Math.cos(45.00)
你错在了这里，你输出的45.00你自己认为是度数45°，其实是double = 45.00
你需要先转化45.00到度数，然后再用上边的
a / Math.cos(Math.toRadians(45.00))
static double toRadians(double angdeg)
Converts an angle measured in degrees to an approximately equivalent angle measured in radians.
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