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In-triangle-ABC-prove-cos-A-2-gt-1-4-2a-b-c-R-R-2r-a-




Question Number 173709 by dragan91 last updated on 16/Jul/22
In triangle △ABC prove:  cos(∡(A/2))>(1/4)∙((2a+b+c)/( (√(R(R+2r_a )))))
IntriangleABCprove:cos(A2)>142a+b+cR(R+2ra)

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