Question

Find the value of sin 49° 20' cos 40° 40'+cos 49° 20'sin 40° 40'.

please tell me answer immediately​

Answer 1

Answer:

sin(90)= 1

Step-by-step explanation:

We know that sin(A+B)=sinAcosB + cosAsinB

here A=49°20' and B=40°40'

hence the given becomes sin(49°20'+40°40')

now 60'=1°

hence 49°20'+40°40'=90°

and sin(90°)=1