Answer:
sin 40
Step-by-step explanation:
We know,
sinA cosB + cosA sinB = sin(A+B) [Formula]
Here,
A=97 ; B= 43
Now,
sin97cos43+cos97 sin43
= sin (97+43)
=sin 140
=sin (180-40) [sin(180-A)=sinA ; here A = 40]
=sin 40
