Question

(sinB + sinaA)/(cosB- cosA ) = ( cosA + cosB )/(sinA - sinB )

pls help urgent ​

Answer 1

Instead, solve

cosA−cosB/sinA+sinB = sinB−sinA/cosA+cosB

cos⁡A−cos⁡B/sin⁡A+sin⁡B=sin⁡B−sin⁡A/cos⁡A+cos⁡B .

Cross-multiplying

cos2A−cos2B=sin2B−sin2A

⇒cos2A+sin2A=1=sin2B+cos2Bcos2A−cos2B=sin2B−sin2A

⇒cos2A+sin2A=1=sin2B+cos2B

SO the solution set is the set of all angles.