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20 1 1 Liaoning college entrance examination mathematics science multiple-choice question 4
△ ABC's three

inner angle

When sides A, B and C are A, B, C, asisinanb+b (COSA) 2 = √ 2a, then b/a=

Analysis: ∫A Sina sinb+B(COSA)2 =√2A

pass by

sine law

2r(sina)^2sinb+2rsinb[ 1-(sina)^2]=√2*2rsina

(sina)^2sinb+sinb[ 1-(sina)^2]=√2*sina

sinB=√2*sinA

sinB/sinA=√2

∴b/a=√2

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