Please can anyone help solve this? Many Thanks

The side a of a triangle ABC is calculated from the following formula:

a/SIN (A) = b/ SIN (B)

where lower case refers to the sides and upper case refers to the angles opposite those sides. The side b maybe in error by 3.5%

A=56 degrees

B- 44 degrees

Using partial differentiation find the greatest % error in calculated value of a to 5dp

Thanks