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There should be a meeting to find the correct answer to the monthly exam questions of senior three mathematics! ! !
( 1+cosA)/2-cos^2A/2=5/8

cos^2A-( 1+cosA)+5/4=0

(cosA- 1/2)^2=0

cosA= 1/2

A=π/3

cosB=3/5

sinB=4/5

sinA=b/sinB

√3/(√3/2)=b/(4/5)

b=8/5

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