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# How should I solve this? I am unable to understand.

Arun
25763 Points
4 years ago
divide and multiply by $\sqrt{}$1- cosA
you will get denominator as (1- cosA) out of the cube root sign
now put the formula of cosA in terms of sin(A/2)
you will get denominator in sin function now it will cancelled by the manipulation done in numerator and you will find your answer
hope it helps