Question

sin(45°+theta)-cos(45°-theta)=

Answer 1

use A instead of theta
sin(45°+A)-cos(45°-A)
sin45.cosA+cos45.sinA-cos45.cosA-sin45.sinA
=1/√2.cosA+1/√2.sinA-1/√2.cosA-1/√2.sinA
=0

Answer 2

Refer above for the answer