prove this trigonometric function.
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tanA/2=sinA/2/cosA/2
=under root(1-cosA)/2÷under roo(1+cosA)/2
=under root (1-cosA)/(1+ sinA)
=under root(1-cosA)/2÷under roo(1+cosA)/2
=under root (1-cosA)/(1+ sinA)
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