Question

17. ( (4) sin (45+theta)-cos (45-theta) )
( =cos left(90^{circ}-(45+theta)-cos right. )
( (45-theta) )
( left[because cos left(90^{circ}-thetaright)=sin thetaright] )
( =cos (45-theta)-cos (45-theta)=0 )

# 17. sin (45 + 0) - cos (45 - 0) is (1) 2 sine (2) 1 (3) 2 cos (4) O

Solution