已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值

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已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α

已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值
已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值

已知sin(π/4-α）=5/13,0＜α＜π/4,则cos2α的值
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