if tan(1/2)x=2/5 and

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iftan(1/2)x=2/5andiftan(1/2)x=2/5andiftan(1/2)x=2/5andsinx=2tan1/2x/(1+tan²1/2x)=(4/5)/(1+4/25)

if tan(1/2)x=2/5 and
if tan(1/2)x=2/5 and

if tan(1/2)x=2/5 and
sinx=2tan1/2x/(1+tan²1/2x)
=(4/5)/(1+4/25)
=20/29