解:cosα√((1—sinα)/(1+sinα))+sinα√((1—cosα)/(1+cosα))
=cosα[√[(1—sinα)(1-sinα)]/[(1+sinα)(1-sinα)])
+sinα[√((1—cosα)(1—cosα)/(1+cosα)(1—cosα))
=cosα[√(1—sinα)²/cosα²]+sinα[(1—cosα)²/sinα²]
=cosα[(1—sinα)/(-cosα)]+sinα[(1—cosα)/sinα]
=sinα-1+1-cosα
=sinα+cosα
=√2sin(α+π/4)