∵AD平分∠BAC
∴∠BAD=∠CAD=1/2∠BAC=1/2(180°-∠B-∠C)=90°-1/2∠B-1/2∠C
∵AE⊥BC
∴∠BAE=90°-∠B
∴∠DAE=∠BAD-∠BAE
=90°-1/2∠B-1/2∠C-90°+∠B
=1/2(∠B-∠C)
∵AD平分∠BAC
∴∠BAD=∠CAD=1/2∠BAC=1/2(180°-∠B-∠C)=90°-1/2∠B-1/2∠C
∵AE⊥BC
∴∠BAE=90°-∠B
∴∠DAE=∠BAD-∠BAE
=90°-1/2∠B-1/2∠C-90°+∠B
=1/2(∠B-∠C)